Geneticore Boost Although coffee’s one of the absolute worst when it comes to teeth staining, you probably don’t have a problem if you just have a cup or two each morning and stop during the day. Then, the whitening product will be applied on your teeth by using a special tray which shapes into your mouth like a gum shell. Non-prescription home whitening packages include bleaching agents such as carbamide peroxide or hydrogen peroxide. Another natural homemade teeth whitening technique is the usage of crushed strawberries. Intake of calcium products like milk and cheese is good enough in strengthening of teeth and in turn improve teeth whitening. There are literally hundreds of products that will claim to give you a whiter smile in a super short time.