Many people do not understand why a denture has to be made by grinding the remaining natural teeth, can it not be made according to the size of the gap? Although removable denture is comparable to fixed denture, it only requires a very small amount of grinding on the remaining teeth, often due to the need to modify the morphology of the remaining teeth, as well as to prepare for the setting of denture components such as starting brackets and gap retainer positions. In some patients, due to the long period of missing teeth, the adjacent teeth on both sides of the gap are tilted and displaced, and the long axis of the remaining teeth is not in the same direction, which will affect the future removal of the denture; in some patients, due to periodontal inflammation and gum recession, the roots of the remaining teeth are obviously exposed, and the crowns of the teeth are large while the necks of the teeth are small. The root is small, which will cause an obvious gap between the artificial tooth and the adjacent real tooth, and easy to occur food embedment. Therefore, when veneers are placed, the remaining teeth with the above conditions must be reshaped morphologically and a small amount of grinding and cutting must be done to the teeth. After a long period of missing teeth without veneers, the natural teeth opposite to the missing gap will gradually elongate towards the missing gap, reducing the vertical height of the missing gap and making it difficult to make artificial teeth when inserting a denture. In this case, it is necessary to make appropriate grinding and cutting of the cusps of your elongated teeth. If the tooth is severely elongated, endodontic treatment (nerve extraction) will be performed on the elongated tooth and then the elongated tooth will be extensively ground to normal length. In the composition of the removable denture, there are structural components such as the hinges and rings, which must be placed in a certain position on the remaining teeth, and the necessary space to accommodate the hinges and other components must be prepared on the remaining teeth before biting the teeth to avoid affecting the occlusion of the teeth after wearing the denture, such as grinding and cutting a spatulate depression of about 2 to 2.5 mm in length and width and about 1 to 1.5 mm in depth on the edge of the tooth surface where the hinges are placed. The spatulate dimple should be cut out at the edge of the tooth surface where the denture is placed.