Fluoride

Fluoride is a natural chemical compound that is effective at preventing tooth decay. As such, it is commonly used as an ingredient in toothpaste, and is sometimes introduced into local water supplies.

Piquant Toothpaste, a spicy brand of wizarding toothpaste, was noted to be fluoride free on its label.

Appearances

 * Harry Potter films
 * Harry Potter Wizard's Collection — Label Collection book