The first step to understanding fluoride is to grasp that teeth are dynamic, and constantly lose and regain the minerals that make them strong. When we eat sugars or refined carbs, bacteria in our mouths produce acid which removes minerals from the surfaces of our teeth and eventually causes decay. Fluoride is a mineral that can stop, and even reverse, tooth decay.
“Fluoride slows down the bacteria, it makes the surface [of teeth] more resistant," Price says. "And it heals microscopic cavities before they become real cavities." Price advocates the use of fluoride, as does the ADA, but some health professionals have expressed concerns about overexposure to fluoride, arguing that it can cause pitted enamel.