Over-the-counter
teeth whitening gels and solutions contain a low percentage of hydrogen
peroxide, that may not effectively whiten the tooth if you have badly
stained teeth. Tooth sensitivity is a common side effect from any teeth
whitening options. Always seek the advice of your dentist before using
over-the-counter teeth whitening methods, or talk to the pharmacist
on-site where you are buying the product for more in-depth information
on specific brands.