Most people have a total of thirty-two permanent teeth up and down, of which the last four large teeth are also called the third molars, which is the eighth tooth counting from the middle of the incisors, usually grow out after the age of about twenty years of intelligent development some people are older, so they are also called intelligent teeth, or wisdom teeth for short. Most people’s wisdom teeth do not grow well, this is because in the process of human evolution, life habits have changed, the food obtained more and more soft, no longer need strong chewing force, gradually causing the jawbone degeneration, shortening, and the number of teeth size change little, so that when the wisdom teeth grow out other teeth have filled the alveolar bone, there is no wisdom teeth position, so that the wisdom teeth eruption is blocked, so crowding occurs In this case, the wisdom teeth may become crowded, grow backwards, grow curved, or fail to grow out. The medical term for this is “blocked wisdom teeth,” also known as blocked teeth.