1. The bleaching of dead teeth is very quick after bleaching and is not suitable for cold light whitening;
2. Whitening agents have no effect on filling bodies and porcelain crowns, so these patients do not belong to the cold-light whitening indication group.
3. Severe tetracycline teeth, fluorosis, or other discolored teeth caused by enamel dysplasia may cause greater discomfort to the patient, which is not a cold and white indication.
4, people under the age of 16, pregnant women and severe periodontal disease patients will not be suitable for cold light whitening.