Finally, your braces have come off. HOORAY! Now your teeth are amazingly straight, perfect and just plain gorgeous … and they feel so smooth. Now you want to keep them that way, right? That’s where the retainer comes in. Teeth are supported by living tissue so they'll continue to move throughout your lifetime. If you want them to stay set in their beautiful new position, wearing a retainer helps prevent them from shifting back to where they once were. It doesn't matter whether you had metal braces, clear ones or removable Invisalign™ braces. If you want your amazing teeth to stay in their perfect place, you need to wear a retainer.