Wisdom teeth are so called because they do not usually appear until the age of 18 to 20, by which time people were supposed to have become wiser. But surveys have shown that at least 19 percent of the population of central Europe have failed to cut one or more wisdom teeth.
These teeth are the third molars and help in the process of grinding and chewing food. There should be four of them right at the back of the mouth next to eight other molars. Nearer the center of the mouth are eight bicuspids (or premolars) followed by the four cuspids (or canines) which are used for cutting and tearing food.
The eight front teeth or incisors, are used mainly for biting and cutting, while the upper ones enable them to identify objects by nibbling.