Hygienic condition of dental chair. Is there a sanitary dead corner? Sanitary dead corner refers to the part that is difficult to clean or can't be cleaned. Some lamp arms have rubber sleeves to cover the joints and keep them beautiful. Strictly speaking, these rubber sleeves are also sanitary dead corners, and bacteria will remain. The chair surface material can be disinfected with disinfectant (such as alcohol), if not, it does not meet the hygiene requirements. Strong suction and weak suction require disposable straws. If the straw can be reused, it should be able to withstand the high temperature disinfection of 135 degrees. Of course, multifunctional foot switches and non-inductive lights are all designed to meet the needs of hygiene.