Patient Question: What should I do if I have a black line on the edge of my porcelain teeth? Description: I’ve had porcelain teeth on my incisors for four or five years, I’m only 20 years old, and now the lines are black. Hope to provide help: I hope the doctor to give me advice, if I can do all-porcelain teeth? Chinese Academy of Medical Sciences Plastic Surgery Hospital Oral Plastic Surgery Department Wang Yuhua replied: What is porcelain teeth edge black line: normal gums are light pink, while some porcelain teeth in close to the edge of the gums are gray or gray-black, and the normal tooth edge of the gum color is not consistent, the phenomenon is called the gum black line or gray line. Porcelain tooth edge why there will be a black line: the most clinically seen is the metal porcelain teeth, metal chemical instability, its metal ions precipitation, deposited in the strong edge of the gums, so that the gum edge is gray-black. How to change the black line on the edge of the porcelain teeth: the front teeth are best to do all-porcelain porcelain teeth, currently the most clinically used zirconia all-porcelain teeth, many clinics and patients who come to the hospital called to do the crown, the location of the neck of the tooth must be handled well. Porcelain teeth every doctor to do, but each doctor to make the effect is not the same, it is a doctor’s skills, aesthetic as the main, nurses, mechanics, patients themselves multiple coordination and cooperation of the community.