Toothpaste containing hydroxyapatite is available over the counter because it was previously approved for use in preventing cavities. “That is why we did the test, and it worked,” Amaechi said.

Formulated with hydroxyapatite—a mineral naturally found in bones, dentin, and enamel—this toothpaste supports enamel health while gently whitening teeth. Enzymes from Papaya and Pineapple ...