Patient Question: Disease: Yellowing in the incisors. Description of the disease: The yellowing of the incisors outward for several years, only a little at first, but now the area is large, once to the hospital to clean the teeth, the doctor said it is plaque corrosion can not be washed away, do cold light whitening effect is also not good. If it’s plaque, will it get worse? How to cure it? Hope to provide help: If it is plaque, will it get worse and worse? How to cure it! Liu Zhi, Department of Oral Plastic and Reconstructive Surgery, Plastic and Reconstructive Surgery Hospital, Chinese Academy of Medical Sciences, replied: Hello, first exclude whether the cause of tooth decay, you can consider the teeth whitening, or porcelain veneers to improve.