A prosthetist constructing a full denture is rendering a health service to his pa tient equal in importance to the services rendered by any other specialist in the field of dentistry or medicine. As the success of the denture involves a high degree of craftsmanship, it has been too often thought of as a craft rather than a health service. In the lives of many, the artificial den ture is a necessity. Without it, they would be unable to properly masticate, digest and assimilate foods essential to maintain health. It is an essential for the main tenance of self respect, social position and employability. The work of the dental prosthetist re quires a knowledge of histology, anatomy, physiology and other basic sciences. The artificial denture must function as part of a living organism. The denture made with a disregard of these factors, or one used after tissue changes contraindicate its continued use, may not only fail in restoring function and esthetics, but may cause oral irritation, rapid resorption or destruction of supporting tissues and malignant degeneration. Ill-fitting den tures may be the contributing factor in temporomandibular joint disturbances, tinnitus, vertigo, defective hearing, head ache and facial neuralgia. Probably the most common ill effect of an ill-fitting denture, and one too seldom given con sideration by either the dentist or the physician, is the effect of continued oral discomfort upon the nervous system and, indirectly, upon general organic function. Edwin P. Seaver,1 said, “malocclusion consciousness removes another symptom complex from the waste basket of neurosis.” Malocclusion is only one of many factors in denture prosthetics which may contribute to neurosis. Many patients being treated for neurosis, gastro intestinal or other organic disturbances, cannot be restored to health until they receive a compatible denture service. The elimination of oral foci of infec tion as a health hazard has placed added responsibilities upon the dentist. The rendering of a denture service to meet the biomechanical needs of the patient is of equal health importance. The possi bility of this service being rendered by the dental laboratory technician who is untrained in the biological sciences has been mentioned. No one seriously inter ested in public welfare, who is familiar with the biomechanical aspects of denture service and their relation to health, could make such a suggestion. In the interest of public health, the dentist who is re sponsible for the rendering of this import ant health service must be given progres sively better training in all basic sciences. O f all sciences in the practice of den tistry, perhaps that of greatest importance is the science of articulating teeth. It involves every phase of corrective or restorative dentistry. The correlation of