If teeth are lost for a long time without veneers, the entire oral and maxillofacial system will be affected in many ways: First, the chewing function is reduced, and the missing part cannot bite, which affects the digestion and absorption of food. Secondly, because individual teeth are missing, long time without restoration will cause the oral tissue to change and affect the alignment of teeth in the whole mouth, often manifesting as the adjacent teeth tilting to the missing area to make the gap smaller and the opposing teeth elongating, resulting in early contact or interference, thus leading to the disorder of biting and jaw relationship; in serious cases, the loss of a tooth often causes the disuse of one side of the tooth, making the occurrence of periodontal disease and caries significantly increase. Thirdly, it causes periodontal tissue lesion, the missing teeth for a long time, the adjacent teeth tilt to the missing teeth, the opposite jaw teeth elongation causes food embedment, and then periodontal disease occurs. Fourth, the loss of front teeth often affects the aesthetics and pronunciation. Language is formed in the mouth, and front teeth mainly affect the accuracy of pronouncing dental sounds (eat, poetry, know) labiodental sounds (divide, fly, put) lingual sounds (de, special, difficult). In addition, tooth loss can cause lesions in the temporomandibular joint, with severe problems such as restricted mouth opening, joint pain, and joint popping. Therefore, patients who have had their teeth extracted are advised to follow the doctor’s instructions to have their dentures placed on time.