Dental appliances may have side effects such as causing tooth sensitivity, damaging the gums, and harming the surface of the teeth. If used for a long period of time, it is likely to cause tooth pain, tooth irritation and, in severe cases, inflammation of the dental nerve. Since the amount and concentration of the oxidant used in the device cannot be controlled, it may cause some damage to the gums or nerve, and if porcelain teeth are used, it may lead to discoloration of the restoration, gingivitis and other problems. Tooth whitening devices may also cause damage to the surface of the teeth, such as causing loss of finish and scratches on the teeth, thus affecting the aesthetics of the teeth. If you want to whiten your teeth, it is recommended that you try to go to a regular hospital for the operation, or if you want to use home whitening, you should follow the doctor’s instructions and not just use a dental instrument.