One of the most popular aesthetic dentistry procedures is teeth whitening. This is because it's a simple process most Brampton dental clinics offer. It is also a very reasonable way to brighten your smile. Reasons behind teeth discoloration. With age, the color of our teeth starts to darken and may start appearing stained or yellow. There are a number of reasons this happens. Common problems affecting the teeth and creating darkening or discoloration include. 1. Age: age is a big factor that can lead to darkening of the teeth. As you age the primary layer of the enamel gets slimmer making the yellowish dentin layer come out. 2. Certain drinks: drinking dark beverages coffee tea and wine or many other beverages people enjoy that can cause teeth staining. 3. Food: some kinds of food can cause surface discoloration. Foods that can do this include dark veggies such as beets, fruits with a lot of pigm...