The number of roots for each type of tooth varies. They erupt from the age of 18 onwards but are often surgically removed. Wisdom teeth are also called third molars. They are used exclusively for crushing and grinding. Each molar typically has four or five cusps. Molars are the flat teeth at the rear of the mouth. They are used for holding and crushing food. Each premolar generally has two cusps, hence the name bicuspid. Premolars (bicuspids) and molars have a series of elevations (points or ‘cusps’) that are used for breaking up particles of food. The canines (or cuspids, meaning a tooth with a single point) are on either side of the incisors. The biting section of an incisor is wide and thin, making a chisel-shaped cutting edge. They are used for cutting, tearing and holding food. The incisors are the middlemost four teeth on the upper and lower jaws. If wisdom teeth have been removed there will be 28 teeth. This is made up of four incisors, two canines (or cuspids), four premolars (or bicuspids), four molars and two wisdom teeth (also called third molars) in each jaw. The permanent dentition consists of 32 teeth. How many teeth do we have, and what are their different types and functions? Teeth tend to erupt in parallel, so for example, the top molar on the left side should grow in at about the same time as the top molar on the right. By 12 years of age, most children should have a full set of permanent teeth, except for wisdom teeth. Primary (baby) teeth are usually replaced by adult teeth between the ages of 6 and 12. When do permanent teeth start coming through (erupting)? American Journal of Physical Anthropology 123(2):172-80.Adult teeth are also called permanent or secondary teeth. Variation in crown and root formation and eruption of human deciduous teeth. A study of the time of eruption and root development of the permanent teeth between six and thirteen years. American Journal of Physical Anthropology 21:205-13. Formation and Resorption of Three Decideous Teeth in Children.
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