In fact, dental implant is not a big surgery, as long as you do not have serious heart disease, high blood pressure, diabetes or other blood diseases, and can accept a minor surgery like tooth extraction. The pain is a little better than tooth extraction, and you will have a swelling sensation for two or three days after implantation, which will be fine once you get used to it. Dental implant is an artificial tooth root implanted in the bed of the missing tooth, when the root grows firmly with the bed, then a realistic porcelain tooth is attached to the root, so that the artificial tooth planted is both strong and beautiful, and strong and durable as the third set of human teeth. What are the contraindications of dental implants? 1. Systemic contraindications (1) Senior citizens and those with poor nutrition are not suitable for implant restoration. (2) Patients with metabolic diseases, such as diabetic patients p osteoporosis patients with chondromalacia deformation osteitis, etc., should not perform implant restoration. (3) Patients with hematological diseases such as leukemia and other bleeding disorders. (4) Patients with collagen diseases, such as pathological immune deficiency and inflammatory changes in collagen tissue scleroderma Schelling’s syndrome rheumatoid arthritis, etc. (5) Implant prosthesis may become a focal point of infection, such as a history of bacterial endocarditis, heart transplantation and other organs should not be implanted. (2) Local contraindications (1) If there are pathological changes in the alveolar bone, such as localized foreign root granuloma cysts and inflammatory reactions, implants should be performed after eliminating the above pathological changes. (2) Jawbone that has undergone radiation treatment. Since the bone cells and blood vessels in such jaws have been damaged after radiotherapy, it is easy to cause implant failure. (3) Patients with oral mucosal lesions, such as leukoplakia, lichen planus and various types of stomatitis, are not suitable for oral implant restoration. (4) Patients with dry mouth syndrome, dry mouth caused by age autoimmune diseases or long-term medication, reduced saliva flow, etc., are not conducive to self-cleaning of the implant denture and may lead to peri-implantitis. (5) Diagnosed night grinding clenching teeth and other parafunctional activities are not effectively controlled, and the implant is at great risk of traumatic loading. (6) Those who have too poor oral hygiene.