Why teeth turn yellow? Teeth flip yellow for 2 reasons, each of that tend to accelerate with age: Enamel thinning Baking soda might facilitate to discolor teeth that have old. The outer layer of teeth consists of enamel, which is colored almost white and protects the deeper tooth structure. Beneath the enamel is a layer of tissue called dentin, which is yellow-brown. When the enamel layer thins or wears away, the teeth begin to look darker. Acidic foods, gum disease, and aging can wear down tooth enamel. Some people also have enamel that is naturally thinner. Stains Specific foods and beverages, such as coffee, can stain the teeth. Some foods that stain the teeth may also wear down the enamel, increasing the yellowing. Other sources of stains include smoking and tobacco products and certain types of antibiotics. How to whiten teeth naturally Here are natural healthy teeth whitening products help to get whiten teeth : 1. Making dietary changes Eliminating foods that ...