How Do Teeth Retainers Work and What Do They Cost?

1. What Is a Teeth Retainer? A teeth retainer is a custom-made oral device made from a combination of wire and plastic. It is used after braces to help maintain the new position of your teeth. The retainer prevents teeth from shifting back to their original alignment and can be either removable or fixed inside the mouth. It is usually worn for a certain period each day or night as advised by the dentist.