Missing teeth, if left without dentures for a long time, can cause damage in many aspects, mainly: chewing function decreases, periodontal tissue lesions, pronunciation dysfunction, affecting the aesthetics, lesions on the temporomandibular joint, etc. The degree of impact on chewing function varies depending on the location and number of missing teeth, such as missing molars, especially the first molar, or when there are more missing teeth, the impact on chewing function is greater. Food is ground up after chewing, mixed with saliva and moistened, easy to swallow, at the same time, a variety of digestive enzymes in saliva also mixed with food, chewing has the effect of stimulating peristalsis to the stomach and intestines, also help the digestion and absorption of food. If the chewing function is affected, the food cannot be well moistened and there is a dry feeling when swallowing; the food cannot be ground and there are large pieces of food that are not easily digested, increasing the digestive burden of the gastrointestinal tract and affecting the normal absorption function, thus affecting the function of the heart, lungs, liver, kidneys and other organs. This effect is not immediately apparent, but is a slowly progressing, long-term effect that is easily ignored and can eventually develop into heart disease, diabetes and other diseases, affecting the quality of life and reducing life expectancy. Then the adjacent natural teeth on either side of the missing area will tilt toward the missing area, while the teeth opposite the missing area will elongate. In this way, there is a gap between the neighboring teeth, and it is easy to embed food, if it cannot be removed in time, it will easily lead to caries, tooth allergy and periodontal tissue disease, caries is manifested as the loss of hard tissues of teeth, tooth allergy is manifested as the sensitivity to hot, cold, sour and sweet food, feeling pain, all need to go to the hospital for treatment, at this time, even if you make dentures, it is not easy to solve the problem of food embedment. Therefore, it is necessary to make dentures in time.