Dental hygiene companies advertise toothpaste that whitens your teeth, but these have been shown to cause damage to your tooth enamel when used regularly. Other side effects of commercial teeth whiteners include teeth sensitivity and gum damage due to irritation of soft tissue in the mouth. In some cases, the side effects caused by teeth whitening products are irreversible. There are many reasons to switch from commercial, store-bought products to natural teeth whiteners. Aside from the fact that store-bought products contain ingredients that are harmful to your oral health, natural teeth whiteners will provide a more effective cleaning for your teeth.