The average adult has 32 teeth, a combination of molars, canines, and incisors. By middle age, however, most adults are missing at least one tooth due to an injury, decay, or gum disease. Though many people choose to forgo tooth replacement our team at Tyagi Dental Clinic will tell you that every tooth is important. Each plays a vital role in the structure of the mouth and in relationship to the remaining teeth. Leaving the space where a tooth once stood can have serious consequences. There are many reasons why severely decayed or missing teeth should be replaced as quickly as possible.