Just like the color of our hair and eyes, your teeth’s natural tint is hereditary. Some people have very white enamel (which is the thin coating on the teeth’s surface) while others have a more yellow hue enamel.
Environmental factors also play a role. Like the rings of a tree, teeth indicate a lot about a person’s health and history. For example, when you were young and took antibiotics tetracycline or amoxicillin can have an effect on the calcification process, and which may cause discoloration.
Some foods may also darken teeth. Coffee, tea, red wine, and cola are just some of the common culprits. Frequent cleanings may help, but for severe food stains, it may require a whitening product or procedure.