In fact, the whitening effect of toothpaste is minimal, and it can even be said that it does not play any whitening role. Because the whole brushing time is relatively short, up to about 10 minutes, even the most effective whitening products in the clinic should be kept in the mouth for more than 40 minutes at least, and it also needs to be operated with instruments, so the conventional toothpaste does not have too good whitening effect. If patients have a need for this, they can visit the stomatology department and have their doctor perform cold light whitening, which can achieve a whitening level of two shades higher through the cold light whitening instrument with the gel. The general whitening effect can be maintained for about 3-5 years, and the treatment can be repeated later if needed.