Tooth whitening has become common in many cultures around the world over the past 10-20 years. The purpose of tooth whitening is to reduce staining and darkening in the enamel that occurs in adult teeth. The most common reasons for darkening and staining of the enamel include frequent consumption of coffee and wine, smoking and usage of tobacco products. Frequent consumption of other foods also have the ability to stain our teeth on a daily basis. Teeth whitening can be done in an attempt to restore the original shade of your enamel if you still have enough thickness and strength in your enamel. The process of whitening involves the usage of 20% carbamide peroxide chemical that cleans out the pores of the enamel. The risks involved in tooth whitening if done too frequently include thinning of the enamel, weakening of the enamel, or even hypersensitivity of the teeth. Be sure to ask your dentist if you are a good candidate for tooth whitening before attempting to do so yourself with frequency.