BEST DENTIST IN CHENNAI! If you have your natural teeth, your smile reveals the condition of the enamel that covers the outer layer of each tooth. It’s the hardest, most mineralised substance in your body. As strong as it is, it’s no match for the acid created by the bacteria in your mouth. The result? Tooth decay. Enamel forms a barrier that protects the inner, more sensitive layers of your teeth. It’s important to do what you can to avoid the erosion of the enamel on your teeth. The erosion process is called demineralisation.