Four groups of patients are subdivided related to the degree of severity of the trouble of haemodynamics. Main reasons for the decreased loadability are the lack in oxygen in the capillary range, increased infections of the respiratory systems and an altered situation of defense. The multitude of patients of the groups I and II can be treated in child's stomatology. The endangering of the patient acc. to its loadability, the application of local anaesthetics without supplement of means affecting the circulation and a protection by antibiotics with all the surgical interventions are prerequisites.