As you age, your teeth will become less white. That’s just the way it is. As a man, your teeth are naturally going to be less white than women’s teeth. Children have the whitest teeth. When you look at the tooth, you see the outside enamel. Inside the tooth, we have the dentin, which is a naturally darker color. Children’s teeth have a larger percentage of enamel. Once we get down into the dentin, men have the largest percentage. Therefore, as time goes on, the wear and tear teeth naturally start to become darker. Also, the food we eat like coffee, tea, berries slightly color and stain our teeth.