When a tooth is frequently exposed to acid—for example, if you eat or drink often, especially sugary or starchy foods or drinks—the enamel loses minerals. Mineral loss causes a white spot. Early decay.

This can stop or reverse tooth decay. Enamel can self-repair using saliva minerals and toothpaste fluoride. Continued tooth decay causes mineral loss. Enamel deteriorates over time, causing cavities.

Fillings treat tooth cavities. A dentist removes decayed tooth tissue and fills the space with filling.