Add one packet of cleaning crystals. Essix and Essix Plus retainers from. CatLady1984 • 4 yr. That seems like a lot to me for the retainers, but I’m also in the Midwest where pricing might be different. My ortho gave me one set of Vivera retainers and said wear them 24hr a day for 6mths then at night afterwards, which I did. According to Invisalign, the lifespan of Vivera retainers are 90 days if worn full time (22 hours/day). Usually, a set of retainers are included in the price you’re given, but additional sets (if you lose or break the first set) will be more. just not worth the 1300$ to me imo idk. Find a doctor. 94 Clear Retainers:. Doctors who have used Vivera are more satisfied with Vivera retainers than with other retainers 2. If I were to buy again I think I'd try to see if I could find a cheaper 2-set price of like $250-$300 and just be very good about rinsing/brushing them daily and giving them a. I got a set of 4 this year for that price, and I know that was the cost years ago when I first started. $330. You may need to replace them periodically as they are likely to experience wear and tear over time. Start your journey towards. If/when they need replacement, you can go to a local dentist for the Essix type. In our office we include a set of Invisalign retainers with every case. Because Vivera retainers should. Permanent. Concern is doing invisalign for single arch may create disharmonious bite e. Richard Lee | Jan 3, 2022 | General Orthodontics , Invisalign , Orthodontic Treatments , Retainers | 0 comments Table of ContentsKeep your aligners and retainers odor free and hygienic with a cleaning solution designed specifically for aligner care. Vivera retainers are designed with your convenience in mind. The ones that orthodontists usually order from invisalign are known as vivera retainers. First 3-6 months after orthodontic treatment. Invisalign retainers cost. Essix retainer replacement cost. Sunday. Treatment times vary depending on the complexity of your case and must be determined by your doctor. Vivera retainers tend to cost more than other plastic retainer brands because they’re made with the same durable material as Invisalign. Any time retainers are lost, damaged, thrown away, etc. 332. $250 per year. Vivera retainers cost anywhere from $400 to $1000. Gently shake/agitate for 20 seconds to dissolve and distribute crystals. If you are getting your braces off soon, and are interested in learning more about the clear Vivera retainer, call Parks Orthodontics today at (757) 874-6655. Removes plaque from aligners and retainers in about 15 minutes : Designed to keep aligners or retainers odor-free, hygienic, and clean on the go : Helps keep Invisalign aligners or Vivera retainers odor-free, hygienic, and clean : Removes plaque from aligners and retainers in about 15 minutes : Package Includes : 50 packets of cleaning crystals. 00 – $810. Not in Invisalign treatment? Your doctor can provide you with customized Invisalign whitening trays. 00. Check our Low Monthly and No-Interest CareCredit Payment Plans. Add one packet of cleaning crystals. I would say “listen” to your teeth and slowly reduce your wear time until it is comfortable. Whichever type of retainer you choose, you'll need to factor in the lifetime cost of using one when budgeting for your orthodontic treatment. Learn more How much do Vivera retainers cost? Invisalign Vivera retainers cost slightly more than most clear retainers due to their durability. We advise cleaning Vivera Retainers using a clean toothbrush or denture brush with anti bacterial soap under some cold water. You transformed your smile with the world’s most advanced clear aligner system. The usual price range is $600 to $1,200 for the whole set. Past patients may be eligible after a brief consultation and assessment of their current smile. Try somewhere else imo. SAN JOSE, Calif. S. The cost of Invisalign Vivera retainers typically ranges from $300 to $800 or more per set. Buschang, P et al. At Parks Orthodontics, we strongly suggest wearing your retainer as instructed by your orthodontist to protect and keep your smile straight and healthy. The goal of Phase 1 treatment is to develop young jaws and/or arches to make room for existing teeth and for incoming permanent teeth. 1. They are made by the same 3-D digital imaging as Invisalign for a tight fit. The Vivera retainer is a thin splint which is worn at night and keeps the teeth in position. The cost of getting these retainers ranges from $400 to over $1,000 for four sets. Doctors who have used Vivera are more satisfied with Vivera retainers than with other retainers 2. 99 $115. An Invisalign Vivera retainer looks like an Essix retainer:. Vivera retainers are designed with your convenience in mind. Vivera retainers are also created using the same technology as Invisalign and. I finished treatment in February 2022 but ended up having problems with my final Vivera retainers (you may remember my posts). Vivera® is 30-50% stronger than more durable than other brands or kinds of clear retainers. Invisalign clear aligners are a popular orthodontic treatment option instead of traditional metal orthodontic braces and wires. Any time retainers are lost, damaged, thrown away, etc. There is no fixed price for Vivera retainers (Invisalign retainers), but you can purchase them in sets of four, which helps bring the price down a bit. However, some doctors will charge more or less than others, and some will opt for other types of retainers that come with a more affordable price tag. 2, 1999. Invisalign clear aligners are made from SmartTrack material, so they are more comfortable and easier to put on and take off. That is, they help to maintain the final tooth position that the Invisalign treatment achieved. Align Technology ’s Vivera Retainers with Precision Bite Ramps are the first retainers on the market that can be customized to provide additional support after deep bite correction, the company reports. post. He then added a fixed retainer put to prevent this happening again. Highly recommend Hawley retainers. com, the best-selling product in the category. Answer: Retainer you can get your Vivera from another Invisalign retainer, but there is paperwork to fill out and your record has to be transferred from the original guy over to the new guy. Friday. So some patients get double for the price of one. I wore my last tray as a temporary retainer until my Vivera arrived. You may expect to pay anything from $150 to $800 for a whole set. Clear Correct’s price is. Wearing a retainer post-orthodontic treatment is essential for retaining your beautifully aligned teeth. Price From. which is important since you’ll wear it while you sleep. 2011. Cost: Vivera retainers come in four sets of retainers. 4. These cost about £130 per set. If you only need retainers for the upper set of teeth, expect prices close to $500. Koo will then design your retainer directly on the 3D. Aim: To investigate the cytotoxicity and estrogenicity of Vivera® retainers by assessing their biological behavioral effects as-received from the manufacturer and after retrieved from patients. My ortho told me I was getting Vivera, which I have. Edit: My teeth are still in place (even my orthodontist said so) and the aligners and retainers do still fit. Shieh’s. $150 – $300. I finished Invisalign in early 2020 and paid extra for 2 Invisalign retainers (not Vivera) from my dentist. The kind of forever where fifty years of wearing retainers, followed by a week long slip up will still mean that your unobliging teeth will start to dance back to the position they were in before you trussed them up in Invisalign. 17/Count)We offer different types of retainers to fit your orthodontic needs. Sponsor’s computer is the official clock of the. Each of the remaining three Vivera retainers would be worn for 1 year apiece, every night while. My husband paid $500 for his first set of 4 in 2018. Treatment dental fees with indicated ranges varies with case complexity. Invisalign cases at an individual treatment price of $990 USD. , fixed lingual retainer), clear plastic, and Hawley retainers. This appliance will look very similar to the Invisalign aligners themselves. Invisalign retainers cost. 00 – $550. Vivera retainers, produced by Align Technology are more durable and the best plastic. It was in the same area as I got mine but two completely different providers. Other retainers are available but tend to be made from less durable materials, such as acrylic. Vivera retainers The Vivera Retainer System consists of a series of doctor-prescribed, thin, clear, plastic removable orth-odontic retainers that maintain and prevent movement of a patient’s dentition. Shop our collection of official aligner and retainer cases from Invisalign today. None. Virtually invisible. I just received 4 sets of the Vivera plastic retainers. This is where an orthodontist uses a piece of metal wire that is glued to the back of the upper or lower teeth. From foam, spray, to cleaning crystals, shop cleaning solutions for. Invisalign treatment is the clear alternative to metal braces for kids, teens, and adults. Step 2: Explore the available options and select the type of retainer that suits your needs. Vivera retainers range in price from $400 to $1,000. However, the national average price for Invisalign is between $3,000 and $5,000. Vivera® retainers are made from methylene diphenyl diisocyanate and 1, 6. It is important to note that like all removable. Or it may be a reminder to take care of your smile and your oral health! To me, wellness is overarching and it doesn't have to do with only food, fitness or mental health. 3109/00016358909007705. My teeth even moved with the brackets glued in place. Indicative price starting from 69,000 THB. Retainers are orthodontic appliances, usually made of wires or clear plastic, that hold the teeth in their positions after surgery or any method of realigning teeth. Vivera retainers are also 30% stronger and twice as durable as other clear retainers 2, and they typically come in packs of multiple sets. 09 USD. Express Plan. 87, No. 25 months. From £300. Traditional braces are stainless steel brackets and wires that are attached to the outside of the teeth. I want to get the ones that are the most resistant and the best in terms of retention. I did not think I had a choice unless I wanted to shell out more money, and as much as I enjoy my teeth, spending like $500 more for. Align Technology Madelyn Valente (408) 470-1180 mvalente@aligntech. Retainer Brite offers a variety of cleaners for personal choice and yet maintains quality in all the variants. Alternatively, you may contact Customer Care at 888-822-5446 or customersupport@aligntech. Lower your monthly Invisalign cost by making a down payment. Vivera retainers are also 30% stronger and twice as durable as other clear retainers 2, and they typically come in packs of multiple sets. The custom FOUR sets of Vivera retainers Special Price $650 only, Actual Price $850. Vivera retainers use Invisalign’s patented SmartTrack™ material, for sturdy, effective retention of your smile. Bonded retainers that are glued to the back of the teeth can cost $250-$500 for one arch or $500-$1,000 for both upper and lower. 97/Count) +. I wear them pretty much every night for the last 4 years, on top of my bonded retainers, 4 teeth on the top and 6 on the bottom. Most insurance providers cover around 25% to 50% of the treatment’s total cost. I would have you wear your first Vivera retainers 20-22 hours a day for the first 3 months following your final aligner. My ortho said retainers (not sure if it’s vivera or essix but I think it’s essix) would be $480/set but they have your digital impressions then it’d be 50% off so $240 but that’s only 1 set. It’s normal and pretty common. (718) 568 0474 5119 5th Ave, Brooklyn, NY 11220. Compared to Invisalign aligners previously made from single-layer (EX30) material. “Providing Align with teeth whitening products, ideal for use with Invisalign aligners and Vivera retainers, is a considerable step toward our mission of improving oral health globally and we look forward to pursuing this mission together. Find out if Vivera clear retainers from the makers of. Indicative price starting from S$3,288. 020 8075 7106 Vivera Retainers. The cost of Invisalign ® treatment is similar to braces, but that’s where the similarity ends. In the UK, the cost of Invisalign Vivera retainers usually falls between £125 to £200 for a combination of upper and lower sets, and an estimated total of about £400. Vivera retainers can be used during the ortho and ortho-restorative process, and are customized for each patient using the same process used to make Invisalign ® clear aligners. ofjune-x • 3 yr. 99/month or $279/year. These sets typically include 4 top and bottom retainers, which means that the cost per retainer ranges anywhere from $150 to $300 per set of top and bottom retainers. morning afternoon evening no preference. e. Vivera retainers are virtually invisible and made from a proprietary material 30% stronger than other leading clear retainer materials, which helps you keep your new smile. If you’re wearing them 20+ hours now, move down to 16 or something and see how it goes. Vivera retainer video. (save 16%) * One-time setup fee may be omitted for patients needing an updated scan to pending work or discretion made by the doctor. It's very consistently around $500 for the 4 sets all over the US. Other retainer. Image courtesy of CA Digital, makers of the MEMOTAIN® RetainerClear plastic retainers cost $200 and up. How long do clear retainers last?We can help you maintain your new beautiful smile for years to come. Know more about invisalign retainer teplacement cost in Miami, FL. At Clear Braces Direct we encourage all our patients to protect their investment and have peace of mind with invisalign retainers, to maintain their new smile. At Stellar Dental, our prices for teeth retainers in Malaysia (per arch) are as follows: Essix retainer is RM200. Types of Retainers: Permanent, Clear Plastic, and Hawley. If you are only wearing at night, Vivera retainers will last at least 1-2 years per set - and you get 3 or 4 sets. Your personalised treatment plan combines Invisalign teeth straightening with an oral hygiene check, professional teeth whitening and Invisalign Vivera retainers to. If after switching to nights I find it's too tight or painful to put in then go back to wearing more often. Vivera retainers. Vivera retainers are designed with your convenience in mind. Last up to 5 years with proper maintenance, easy to take out of mouth while eating, clear and practically invisible. I was quoted 1300 for 3 sets of thick vivera nightly retainers. I got a quote from the same orthodontist office, and I was given the choice of either essix or Vivera (both the same cost) for $280 for top and another $280 for the bottom, or 560 for a set. The precise Essix retainer cost depends on several factors, including your specific case, your orthodontist, and the location of your treatment. 25% NaOCl). Invisalign can cost anywhere between $3,000 and $8,000. Ortodontic clear retainers used to protect the results of Invisalign bracers treatment. So, they scanned me, and I went back into. So I had my ortho to order more sets of last aligners as passive trays until my teeth reach a stable condition and no longer moves anymore! The longer you wear the last set of retainers the smaller chance will be the relapse. As little as 6 months. An Essix retainer is. Angle Orthodontist, Vol 84, No 3, 2014. or. Retainers aren't included in my comprehensive. If a patient opts out of this program, the retainers will cost $350-$500 per set. Hi, thanks for sending your question. In general, upper and lower removable retainers will usually range from $295 - $795 per arch while fixed lingual retainers tend to be more costly at around $995 - $1,495 per arch. Find out more Talk to our Smile Concierge team via phone, online appointment or directly visiting Invisalign Centre to answer your questions. traditional metal braces teenager patients (Qty: 76) rated pain score of 5. This is a rather thick plastic material, designed to last for a longer period of time than other types of clear retainers. Lite PlanIf I remember correctly, yes exactly 7 days from the scan. For a set, you can pay anywhere from £60 to £700. The Essix retainers go up into the palette somewhat, and are more flat against the teeth. Customized retainers that are easy to create, easy to order, and easy to use. Vivera Retainers £480 – 3 x sets i. Bonded retainers, as the name suggests, is a type of retainer. Doctors who use Vivera are more satisfied with Vivera retainers than with other retainers. Align Technology, the parent company of Invisalign®, uses the trade name EX40 for their Vivera® retainers, but it is just another term for the same product. Learn moreHow much do Vivera retainers cost? Invisalign Vivera retainers cost slightly more than most clear retainers due to their. My Invisalign Patient Login. You often have to buy several sets of Vivera retainers at once, making the price around £400 – £700. Starting digital treatment with fast, accurate digital scanning. The alternative would be to get clear retainers with bits ramps. Basically, you’re likely to end up paying. by email, which may contain special offers, information on local providers, and requests for feedback about my. It is not uncommon for other removable retainers to lose their shape over time and need to be replaced. Take the Invisalign Smile Quiz Find a Doctor. If both upper and lower teeth need. Grinding guards dont really retain your teeth. $997 ($9. Sale! Foundation Pack. Am J Orthod Dentofacial Orthop February 2017;151:259-66. In general, upper and lower removable retainers will usually range from $295 - $795 per arch while fixed lingual retainers tend to be more costly at around $995 -. Invisalign. The material of this type of. Honestly, Invisalign VIVERA are meant to last! Down fall is if you have new crown or fillings you need a. I understand clear retainers need to be replaced at least once a year or so. Tonight, while brushing my teeth, I looked and I could've sworn my front bottom teeth had drifted slightly. Doctors who have used Vivera retainers are more satisfied with Vivera retainers than with. This is an uncompromised level of quality that will work to prevent damage to the device that could cost you extra money in replacement fees or repairs. Make sure that the bleach isn’t coming into contact with your clothing. A set of four Vivera retainers can cost between $400–$1,600. I highly doubt you only get 2 sets for that price. Made of long lasting materials, very durable, custom-fit. Only remove them to eat and brush your teeth. The Angle Orthodontist Nov 2017, Vol. I have never seen or heard that they are cheaper. Oral Surg 41:309-13, 1976. $550 * Sets of retainers per order 4 Cost per set of retainers $137. clear plastic retainers (removable): Essix, Vivera, Zendura: Cost of retainer: $225–$550 for one arch (top or bottom). Last Close Price. Follow-up treatment or checks may be needed after you have your appliance fitted, so make sure you check whether this is included in the. At the time impressions were made and the retainers were made off that. Vivera Retainers. So they do need to be replaced as the plastic can stretch so teeth can move. Each set is suggested for one (1) year of usage. 1 Month Subscription; Credits. Let’s explore these three types of retainers below. Details. Here’s a quick overview of the various kinds of retainers you can choose from: On average, Vivera retainers can range from $400 to $800 per set. Find out more. Aspect. Extrapolating that to night-time wear, (8 hours/day) each set would last about 8. 1 Learn about Vivera ® retainers. Hawley retainers, which use acrylic and wires, are another option. It’s important to know that this cost typically includes four retainers so that you have multiple sets. 5mm shaved off L + R sides of lat. they can be replaced for a $25 copay (per arch). Real before and after photos. I'd wear both upper and lower vivera with the additiional. • 3 yr. Often fixed retainers become loose (without your knowledge) on one of your teeth causing ,that tooth to move, which means that retreatment becomes necessary. Black at Appalachian Orthodontics of Lynchburg is pleased to provide Vivera retainers to all patients entering the retention stage of treatment. Clear Essix retainers: From £150 per jaw. Additional Remarks. Vivera retainers are an excellent option for maintaining the alignment of your teeth after orthodontic treatment. ofjune-x • 3 yr. Non-patient setup fee includes the initial scan needed to. Speak to your orthodontist. $600 is crazy high for one made in house. Am I a Candidate? Shop Accessories. As the name suggests, it can be. Estimated Price; Vivera’s Official Website (Align Technology) $400. The Invisalign System uses a series of clear, removable plastic trays (aligners) that fit over teeth. What does an Invisalign/Vivera retainer cost? Invisalign make their own clear retainers under the brand Vivera. 8. 4. If it's 4-5 times the price I would go with the ones from your dentist. How much are Invisalign retainers? The Invisalign retainer cost (Vivera retainers) is anywhere from $400 to more than $1,000 for four sets. Easily removable for eating, drinking & flossing. Essix or Vivera: Custom-fitting thin, transparent plastic retainers designed to fit snugly over your teeth. Professional. ago. $. So I'd recommend taking your Vivera's out to drink coffee, and do the swish before. The MEMOTAIN ® Retainer is a lingual retainer that, like Invisalign’s Vivera retainer, is made from a 3D printer for extreme accuracy. Now I began wearing vivera again for 2 months and my bite is totally wrong, my jaw aches like crazy, my neck is stiff. Today I took off my retainer in the morning and went about my day. Length of treatment: The time required for a patient’s treatment plan is. The biggest difference is the material. The cheapest retainers for teeth are usually Hawley retainers, with Essix, Vivera, and lingual retainers costing more. Since you have 4 retainers, you have excellent reassurance. If both upper and lower teeth need retainers then that means the amount can go as high as $1000. St0ned01 • 7 mo. Cost per set of retainers. Price: $486 – $550 (1 set), $702 – $810 (2 sets) Lifespan: 1 – 2 years*. Essix retainers are among the pioneers of the clear plastic retainer industry. You could also soak your retainer in a mixture of 1 part bleach:10 parts water solution. Shop astrology cases. . Alternatively there are also specialist Retainer Cleaning tablets. With the right care and attention, your removable. Give us a call today at 512-732-0022!Michael Ayzin, DDS says: Nutella, thank you for your question. Saves on toothpaste and polident tablets. All plans also include Zoom! Teeth Whitening, valued at around $1,000, plus a set of Vivera Retainers for use after your treatment has finished. However, you can find high-quality Essix retainers for a little price, like the ones offered by SportingSmiles (for $135 a set). However, the MEMOTAIN ® retainer is a lingual retainer that is fixed to the tongue side of your teeth, like a traditional permanent retainer. Prevent gaps from appearing between your teeth Do I Have to Wear Retainers After My Treatment is Over? Yes, retainers are an important and necessary part of your Invisalign treatment. These slim, modern Invisalign cases keeps your Invisalign aligners and Vivera retainers secure at home and on the road. My teeth felt naked, but fine. Contact San Francisco Dental Office today at (415)777-5115 or visit our office servicing San Francisco, CA. They are made out of more durable material. The cost of Invisalign will depend on what work has to be done. Removes plaque from aligners and retainers in about 15 minutes : Designed to keep aligners or retainers odor-free, hygienic, and clean on the go : Helps keep Invisalign aligners or Vivera retainers odor-free, hygienic, and clean : Removes plaque from aligners and retainers in about 15 minutes : Package Includes : 50 packets of cleaning crystals. They offer a membership with unlimited retainers for three years for $49. 6 pp. Its magnetic closure ensures the case is securely fastened. Utilizing state-of-the-art technology and proprietary material. morning afternoon evening no preference. 19, no. Notably, Vivera retainer is made with the same. Most patients wear retainers full time for the first 4-6 months. Hawley. The most important thing is to choose the treatment process that can give you the best results while fitting in with the look you want and your. That's an insane price for the retainers. So is every budget. 2. Very affordable, more durable than Essix retainers, easy to clean, easy to order online. There are permanent (i. Tru-Tain DX materials are available in 5-inch x 5-inch squares as well as round disks in 125-mm & 120-mm diameters. Under the removable category, ther. I agree to receive information about Invisalign treatment from Align Technology, Inc. Data on file at Align Technology, September 30, 2023. 1 Sven Helm & Poul Erik Petersen (1989) Causal relation between malocclusion and periodontal health, Acta Odontologica Scandinavica, 47:4, 223-228, DOI: 10. Dr. We do go over the Vivera retainers program wit our patients because some like to have an extra case with them, and as you know with vivera retainers you get four sets shipped to your home for a year. One cleansing option you may want to consider is store-bought Clorox (full strength is 5. Your ortho might have been planning on giving you in-house essix style retainers. According to some orthodontists, Vivera retainers tend to be more durable and last longer than Essix. ago. “Open Bite: a Review of Etiology and Management. Vivera retainers are another form of clear aligner that works in a similar way. Office Info. 1. This means you have enough backup should you break, stretch, or lose them. Cost may vary by provider. As a reputable high-quality company, Vivera’s retainers will cost a few hundred dollars, but the exact price varies between providers. Mine are an additional $500 for the Vivera retainers on top of the 4500 for the treatment. All of that adds up to a longer lifespan, fewer replacements and re-orders (less hassle), and a great value. The Invisalign website says their treatment costs anywhere from $3,000–$7,000. The good news is that you are totally done with treatment, and the intention of wearing your retainers full time is to make sure your peridontal ligaments stabalize around the new position of the roots of your teeth. Several factors determine the final cost, such as the provider, where you live, and your specific treatment. Vivera Retainer: 1 pair. It’s normal and pretty common. They can give you a more specific price based on. Retainer Brite Tablets for Cleaner Retainers and Dental Appliances - 120 Count. Download high-quality Sydney, Australia, 2022-10-19 Invisalign Vivera images, illustrations and vectors perfectly priced to fit your projects budget. Traditional braces are stainless steel brackets and wires that are attached to the outside of the teeth. $11. 25 months. Factors such as location, dental provider, and individual needs may influence the final cost. My dentist said that my treatment includes the "standard" Invisalign retainer, but I can purchase a set of 4 Vivera retainers for $675 now or $750 if I wait until after that retainer is worn out. Invisalign retainers cost £125 – £200 per set on average, but there is no fixed price. Your Vivera retainer is. However, there is no specific price of Essix Retainers significantly depending upon whether you go for dental treatment through a dentist or a third person. ago. 3. Retainer costs vary depending on where you buy them. These custom-made retainers are molded from a 3d-digital scan of your teeth, offering a precise fit and a more comfortable feel. The average cost for one Hawley retainer is between $150 and $300, with a set costing up to $600. We take care of your entire smile and our all-inclusive Invisalign treatment packages give you the best price, the best experience and provide you with the best possible result. The price of retainers can vary greatly depending on the type of materials used, the brand, quality, and your dental professional. ago. El material termoplástico del que están fabricados es un 30% más resistente que los alambres u otros materiales, lo que resulta decisivo en su efecto. Buschang, P et al. The initial retainer is included with your treatment. This low price doesn't mean you're compromising on quality of care, though. Made of long lasting materials, very durable, custom-fit. low. Very affordable, more durable than Essix retainers, easy to clean, easy to order online. So, retainers fall into two main camps. Unlike other traditional clear retainers, Vivera retainers are made with the same state-of-the-art technology as Invisalign aligners, which employ 3-D digital imaging, proprietary clear. which is important since you’ll wear it while you sleep. The average cost for Invisalign Full, which most people use, is around $4,000. Generally, the cost for each retainer (either upper or retainer) is anywhere between $100-$500. For the first 3 months after orthodontic treatment is completed, wear your retainer’s day and night. The truth is that Vivera retainers put less force on your teeth than standard aligners. If your dentist made your retainers in-house then it is what’s known as an essix retainer.