Dentistry is the practical application of knowledge of dental science (the science of placement, arrangement, function of teeth) to human beings. A dentist is a professional practitioner of dentistry. A Dentist is skilled in the prevention, diagnosis, and treatment of diseases, injuries, and malformations of the teeth, jaws, and mouth and who makes and inserts false teeth.A Dentist is needed for correct most teeth conditions but there is a clear alternative to closing a tooth gap. So forget ever.