You run your tongue along your front teeth and something feels different. Maybe a gap has opened up that was never there before, or one lower tooth now overlaps its neighbor. Perhaps the retainer you found in a drawer suddenly feels tight, or it will not go in at all. If you have been asking yourself why your teeth are shifting as an adult, you are in good company. It is one of the most common things people notice in their smiles once they are past their teens. The reassuring…
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