Scaling is mainly used to remove the soft dirt, stones, infected substances between the teeth and gums, etc., and is not capable of whitening the teeth. If patients have the need to whiten their teeth, they can go to the dental department of a regular hospital to have their teeth professionally whitened by cold light whitening operation. Before whitening teeth, to remove the gums and teeth around the root of the tartar soft tartar, plaque, etc., 1 week after the scaling cold light whitening operation, the effect will be more ideal, usually whitening teeth can make the teeth to improve the color of the 3 color grades, to achieve a more beautiful effect, according to the teeth of the base color of the different effects are also slightly different.