Periodontal disease and caries and inadequate treatment are the main causes of tooth loss. Tooth loss impairs the integrity of the stomatognathic system. With partial edentulousness, we have several solutions to solve the problem. One solution is to make a partial denture. The decision is made after a clinical examination when we determine the number and location of the remaining teeth and their biological factor. Partial toothlessness can be classified in several ways. The Kennedy classification is the most common and widely accepted classification describing four classes. A partial denture has three basic parts: the base of the denture, the teeth and the elements that will attach to the teeth. If we have made and placed the listed parts correctly, the treatment will be successful. Retention devices resist the forces that act vertically and which try to separate the prosthesis from the bearing. We divide them into direct and indirect means of retention. Clasps, bars, attachment and telescopic crowns are considered direct retention devices because they prevent the denture from moving by attaching directly to the abutment teeth. The planning of a partial denture is based on a vector analysis of the forces and is carried out in such a way that the threshold of biological endurance of the tooth and the tissue receiving the load should always be kept in mind. What the load transfer will be will depend on the arrangement of the retention teeth. Polygonal or square layout is considered the best. In general, partial denture therapy has generally shown a positive effect on the patient's quality of life.