Why teeth move
What causes crooked teeth?
Most crooked teeth come down to a mismatch between the size of the teeth and the space in the jaw. If the jaw is small or the teeth are large, they have to overlap or twist to fit. Family traits play a big part, so if a parent had crowding, you may too.
Childhood habits such as thumb sucking or a dummy used for years, baby teeth lost too early or kept too long, and mouth breathing can all affect where adult teeth end up. Later in life, a knock to the mouth, a missing tooth that lets its neighbours drift, or gum disease that loosens the bone can move teeth out of line.
Teeth also keep moving as we age. Even people who wore braces as teenagers often notice their lower front teeth crowding again in their thirties or forties, particularly if they stopped wearing a retainer. Once the front teeth start to overlap, the crowding tends to build on itself.








