Although tooth enamel is the hardest substance in your body -- even stronger than bone -- it’s still susceptible to tooth decay when exposed to acids in the mouth. Because enamel is composed of mainly calcium phosphate, a calcium-rich diet is essential during tooth development. Fluoride strengthens teeth by replacing some of the phosphorus in...

Although tooth enamel is the hardest substance in your body -- even stronger than bone -- it’s still susceptible to tooth decay when exposed to acids in the mouth. Because enamel is composed of mainly calcium phosphate, a calcium-rich diet is essential during tooth development. Fluoride strengthens teeth by replacing some of the phosphorus in...

Original article and pictures take https://livestrong.com site