Teeth Whitening category you will find toothpaste, mouthwash, dental floss and teeth whitening kits that can break down discoloration on the teeth and thus contribute to whiter teeth. The natural color of the teeth varies from person to person. It is common for the teeth to become discolored over the years if you e.g. drinking coffee, tea or cola. Smoking and sniffing can also cause discoloration. The teeth can also be darkened by certain medications or diseases. Good dental care with daily tooth brushing is a good basis to avoid darkening of the teeth, but sometimes you may need a little help along the way with products designed to remove the discoloration on the teeth.