It is generally necessary to knock out more than 8 teeth in order to constitute a disability. If it is in Zhejiang, the qualified disability appraisal institution in Hangzhou is: 1. Judicial expertise center of Zhejiang University, address: 4th floor, Building No.353 Yan 'an Road 1, Hangzhou; 2. Hangzhou Hao Ming Judicial Appraisal Institute, address: 2nd floor, Block B, Provincial Medicine Building, No.510 Yan 'an Road, Hangzhou; 3. Zhejiang Fahui Judicial Appraisal Institute, address: East of Donghai Hotel 1 Building No.7 Tianmushan Road, Hangzhou; 4. Hangzhou Institute of Criminal Science and Technology, Address: No.31Stadium Road, Hangzhou. Reflect that people need to carry medical records and conclusions of hospital diagnosis and treatment, as well as photos of their illness.