Patient Question: Disease: tooth discoloration after root canal surgery, do not want to do porcelain want to resin restoration. Description of the disease: Hello doctor, I have an incisor (lower left side) after root canal surgery had a layer of light tube curing resin outside the tooth, but still can see the discoloration, do not want to do porcelain restoration, because it is necessary to grind a lot of teeth, but also afraid of braces for a long time there will be dirty things in, I do not know if I can do the resin restoration and shading? Reply: Thanks for your trust! Where was the previous treatment? How long has it been? Patient Question: I was treated last time when I was in college in Inner Mongolia, it’s been more than 10 years, the resin surface is still there, I don’t know if I can remove it again, this tooth is the root canal that I did because of an accident when I was in school. Wang Yuhua replied: The concept of protecting teeth is very advanced and correct. This is the most cutting-edge concept and technology in the international arena. At present, due to the innovation of resin materials and clinical operation techniques, it is fully possible to perform nano-resin veneer restoration to meet the requirements of patients in terms of morphology, alignment and the most concerned color, which has been affirmed and praised by the majority of patients. We would also like to thank yourself for not having porcelain restorations back in the day, otherwise not only would irreversible damage be caused to the teeth and gums, but you would not have the opportunity to have the current nano-resin veneer restoration with good results, but more importantly, the long-term health of the teeth and gums. The current questions for the nano-resin veneer technology explain a few points: 1, discoloration problem: advanced new resin material has reached the restoration effect of porcelain material, and can be maintained for a long time; 2, the technical operation is difficult. This is also the reason for the small scope of the current development. Because, in a limited time, the doctor to complete the tooth color selection, layered filling, tooth sculpture, curing, polishing and other dozen steps in the patient’s mouth, the technical difficulty can be imagined, unskilled doctors also know the difficulties, only to carry out its familiar restoration projects, etc., and naturally can not recommend this technical project. 3, resin material problem. At present, the market is full of filling materials, both the common resin filling materials (cheap) and new nano-resin materials (more expensive), the restoration effect is naturally different. 4. At present, it is a market economy, and the low fee of domestic resin veneer project may also affect the development of this project. In fact, the fee for resin veneers in the United States reaches a level of $800 per tooth. 5, high requirements for doctors: aesthetic, design ability, clinical experience and comprehensive oral clinical skills (filling technology, restoration technology, sculpture technology, bonding technology, polishing technology, etc.); a good understanding of the technical indicators of new resin materials, mastery, and personalized design and treatment according to the patient’s dental situation. 6.Wide range of indications. 7.Minimally invasive. Maximum protection of dental gum periodontal tissue, etc., which is the biggest highlight of this technology, has been gradually recognized by the people.