Genetics
There are several causes of yellow teeth, but genetics is the most common. Most people have teeth that naturally fall between white and yellow, while others’ teeth are whiter or yellower than average.
The color of a person’s teeth is controlled by two main factors: enamel and dentin. Enamel is the outer coating of the tooth that protects it from damage, while dentin is a layer inside the tooth that gives it its shape. Since both of these layers are made up of dead cells, they do not contain any living cells capable of producing natural coloration. The cells in the enamel can produce color when they’re still alive, but after tooth formation, their function shifts from producing pigment to protecting the tooth from damage and keeping bacteria out.
Genetics is important in how much pigmentation you have in your teeth. People with parents and grandparents who have yellow teeth are more likely to have yellow teeth due to genetic factors. The dental environment also matters—if you grow up around people who drink lots of juice or coffee every day and don’t take care of their teeth very well, you’ll probably be more likely to get yellow teeth yourself.
