8. Piercings
Mouth piercings, on places like the tongue, cheek, lip or uvula may be a form of outward expression, but the amount of contact between hard metal pieces and the chippable surface of teeth makes them a hazard to a whole and healthy smile.

9. Over-Whitening
Chasing a picture-perfect set of pearly whites may also cause tooth damage, as repeatedly whitening teeth or trying whitening treatments on already worn teeth can lead to sensitivity and pain.