Cold light whitening is the effective component of activated bleaching agent by illumination, thus accelerating the bleaching effect. The radiation of the light often causes the local temperature to rise, which increases the sensitivity of the patient's teeth. Therefore, the doctor increases the filter in front of the light source, which will make the hot light filter out. Therefore, it is called "cold light". And tile dental experts remind that if there are whitening, patients should also send for a doctor to the hospital diagnosis, many patients, it is to do the whitening, but after the inspection found that they all have more or less of oral diseases, must first treatment, can whiten again.
