Short-term use of compliant whitening stickers has no harm or side effects on teeth. Long-term use of whitening stickers to whiten teeth may cause tooth allergy, gum inflammation, uneven whitening effect, etc. 1. Tooth allergy: whitening toothpaste contains a certain concentration of hydrogen peroxide, easy to cause tooth sensitivity, when the teeth are hot and cold, sweet and sour, mechanical stimulation and other situations may appear soreness. The use of non-compliant whitening toothpaste can also lead to gums, mouth and lips mucous membrane burning sensation. 2. Inflammation of the gums: the gums are very fragile, whitening toothpaste if used improperly may stimulate the gums, resulting in inflammation of the gums, pain and so on. 3. Uneven whitening effect: teeth alignment or improper use of teeth whitening stickers may lead to uneven teeth whitening . Some people stop using whitening toothpaste, there will be a recurrence or darkening of the color of the teeth and so on. Need to whiten teeth can listen to the professional doctor’s advice to adopt a scientific and reasonable method, to avoid buying whitening toothpaste to use, adverse reactions.