Tooth enamel is the hard, outer layer of your teeth that protects them from daily wear and tear. It's the hardest tissue in the human body and covers the crown of the tooth, which is the part visible above the gums. Enamel is translucent, so it doesn't determine the color of your teeth; the underlying dentin does. Enamel protects your teeth from chewing, biting, crunching, and grinding. It also insulates teeth from extreme temperatures and chemicals. However, enamel can erode due to acids from foods and drinks, leading to increased sensitivity to hot, cold, and sweet substances. Unlike other tissues, enamel cannot repair itself because it doesn't contain living cells. Erosion can be caused by friction, stress, and corrosion. Conditions like bulimia, which involve frequent vomiting, can also erode enamel. Saliva helps protect enamel by coating teeth with calcium and other minerals, diluting acids, and removing waste. Plaque, a sticky film of bacteria, can also erode enamel by converting food starches into acids. Signs of enamel erosion include increased sensitivity and cavities. To prevent enamel loss, brush and floss daily, use fluoride toothpaste, and visit your dentist regularly. Avoid excessive acidic foods and drinks. In severe cases, treatments like tooth bonding, crowns, or veneers may be necessary.