“A black spot on your tooth shouldn’t be ignored ... “You should also look for white spots,” Dr. Quartey-Sagaille says. “They can be an early sign of a cavity.” ...

White spots on your lips can be a sign of milla — harmless bumps that will resolve in a few weeks. The herpes simplex virus can cause white spots on the mouth that turn into blisters or sores.

White spots on your teeth can be due to a number of things from malnutrition to poor oral hygiene. Once those white spots turn up it's hard to get rid of them but you can reduce their appearance.