Currently most hospitals and dental clinics do not have a mandatory blood test requirement before scaling. However, it should be noted that a blood test before scaling can be very helpful clinically because scaling itself carries a certain amount of risk. For pre-cleaning patients, blood tests for coagulation and infectious diseases can be performed, which will be of greater benefit to the practitioner and the patient. For example, for routine blood tests, it can be found that the patient has high white blood cells or low red blood cells, which means that the patient has obvious symptoms of infection or anemia, which is not recommended for scaling because of the corresponding risks, and it is recommended that the infection or anemia be controlled before scaling treatment. Also, if the clotting time is particularly long, it means that the patient has a certain problem with the coagulation function. It is then possible to have more than just bleeding gums after scaling in scaling, so that some risk of bleeding can also be avoided. As for infectious diseases, if there is some understanding of this aspect of the patient’s hepatitis before scaling, you can do a good job in scaling to protect both the doctor and the patient, and at the same time better disinfection, in order to avoid cross-infection in scaling or after scaling.