Teeth have pores that act like a sponge; absorbing the colors of the food and drink you consume every day. Over time, those stains continue to get deeper into the tooth and can no longer be removed by brushing or over-the-counter products like whitening strips. To remove these stains, a professional treatment is necessary. The whitening gel in a custom-fitted whitening tray or applied by a technician in-clinic gently opens up the pores and soaks into the tooth and the active ingredients lift the stains to the surface. After whitening, your pores require time to naturally rehydrate and remineralize (ie: pores go back to smaller size). Reducing the amount of colored food (especially coffee, tea, wine, and tobacco) for as long as possible will significantly reduce the chances of your teeth restaining quickly.