It is best to approach a registered dental practitioner for tooth whitening. Your dentist will be able to guide you on the best methods of bleaching, depending on your requirements. Whitening is unlikely to cause serious side effects. Some people can have tooth sensitivity. Others may experience gum irritation after the procedure. Pregnant women are advised against whitening. Since bleaching is a cosmetic procedure, its best avoided until delivery. Although the effects of the bleaching chemicals on the growing fetus is not known.