Today, an increasing number of adults are choosing to wear braces to straighten their teeth and correct malocclusions (bad bites). In fact, it is now estimated that. Dec 15, - This slowly moves your teeth or jaw or both into place. It depends on your treatment, but the average adult has braces for 18 months to 3 years. It usually costs between $5, and $6, Clear aligners: You can skip the wires and brackets with these see-through plastic trays that fit over your teeth.