Excess use of toothpaste

As part of the study, the researchers demonstrated that the major protein in the dentin is converted to smaller fragments when treated with hydrogen peroxide.

Fluoride is a mineral found in water and soil. More than 70 years ago, scientists discovered that people whose drinking water naturally had more fluoride also had fewer cavities. That led to the addition of fluoride to tap water, toothpaste, mouthwash and other products.