A removable partial denture is commonly known as a removable denture, and is a restoration that can be removed and worn by the patient. Patients often come to the hospital and ask how to put on the removable denture and whether it will fall off. The removable partial denture is composed of artificial teeth, abutments and retainers, or clinically known as clasps. The so-called artificial teeth are made of finished resin or plastic teeth, and the retaining hooks are rings placed on the natural teeth to hold the removable dentures in place. The retention principle of the removable denture is to use the natural teeth and the mucosal and bone tissues under the abutment as support, relying on the abutment and retention hooks for retention, and is a restoration that uses artificial teeth to restore the form and function of missing teeth. Nowadays, removable partial denture is still one of the main restorative methods for patients with missing teeth in China.