Teeth whitening systems are generally considered to be safe when used according to directions. Because teeth whitening systems can sometimes be abrasive, it is extremely important to use them only according to the dentist’s orders or the instructions within the kit. If the instructions are not followed, the risk of damage to the delicate enamel of the tooth dramatically increases. Dentists often recommend making an appointment at the office and allowing them to professionally whiten the teeth instead of using a kit that may destroy the enamel or cause an adverse reaction with the gums.