It is also normal to not lose a single tooth at the age of 70. 1. The number of permanent teeth in a person’s life is 28 to 32. Among them, there are a total of 12 front teeth, 8 premolar teeth and at least 8 molar teeth. Wisdom teeth (third permanent molars) grow in some people and do not grow or are blocked in others, one each on the upper, lower, left and right. Human permanent teeth have important physiological functions such as maintaining aesthetics, cutting food, and exercising chewing. 2. People often have problems with their teeth in their daily life due to poor living habits, poor oral hygiene or smoking, drinking, etc., such as caries, periodontal disease, loose teeth or loss of teeth, etc., resulting in missing teeth, which affects aesthetics and chewing function. 3. Some people pay special attention to oral hygiene in their daily life, usually pay attention to nutrition, balanced diet; found that dental problems, timely medical treatment, etc., can be in the age of 70 years old or even 80 years old, full of permanent teeth not missing a tooth, and can exercise normal chewing function. Dental discomfort, should be timely consultation, improve the examination, a clear diagnosis, under the guidance of the doctor standardized treatment.