You might wonder why. The reason is that his retainer is not only expensive, it's also solving problems in his mouth without any pain. Read on to learn what a retainer is and how it can help you. A retainer is a piece of plastic and metal that is custom-made for each individual kid who needs one and fits the top of his teeth and mouth. No two retainers are alike, even though many look similar.
Retainers are really common.
Other people wear them to close gaps in their teeth, to help with speech problems, or to solve certain medical problems. For specific medical advice, diagnoses, and treatment, consult your doctor.