People suffering from the following diseases or in the following states are not suitable for routine scaling treatment: People suffering from various bleeding diseases, such as patients with thrombocytopenia, leukemia, uncontrolled type 3 diabetes mellitus, uncontrolled hyperthyroidism, etc. should apply appropriate amount of pro-coagulant drugs in advance to control the clotting rate to avoid bleeding during scaling; Patients suffering from certain acute infectious diseases, such as acute hepatitis active stage Patients suffering from certain acute infectious diseases, such as active hepatitis, tuberculosis, etc., should also wait for the disease to stabilize before they can go to the hospital for scaling. This is partly because of your own condition, but also to avoid infecting others. Patients with local inflammation of soft and hard tissues in the oral cavity in the acute stage (except acute necrotizing gingivitis) should wait until the acute stage has passed before scaling to avoid the spread of inflammation to the blood. Patients with malignant tumors in the gingival area are not easy to receive routine scaling to avoid tumor spread. Patients with active angina pectoris, myocardial infarction that has occurred within six months, hypertension and heart failure that cannot be effectively controlled should not receive routine scaling treatment. Of course, patients in the above-mentioned situations are not always not allowed to have their teeth scaled, but they must choose the time of scaling carefully and have their teeth scaled by experienced medical professionals in the hospital after their systemic symptoms have stabilized, in order to avoid harm and achieve the best results of scaling treatment. In addition, it is worth mentioning that pregnant women should receive thorough oral treatment before pregnancy, because scaling during pregnancy (especially in the first and second trimesters) can greatly increase the probability of miscarriage.