Hydrogen peroxide is a commonly used chemical which is regularly used in teeth whitening procedures as part of a complete smile makeover. However, it is also used in common cleaning products and therefore should be treated cautiously. Inevitably, the higher the strength of this chemical in tooth whitening products, the more effective it will be, but equally so will the side effects which may possibly include burning of the gums if not applied correctly, and also damage to the enamel of the teeth potentially. For these reasons, it is recommended that you consult your local cosmetic dentist for advice rather than simply attempting to use even  the best at home teeth whitening products.