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There are five teeth in each quadrant, composed of two incisors (central and lateral), a canine, and two molars. These teeth are referred to as letters A, B, C, D and E. The primary teeth begin to erupt at 6 months of age. The permanent dentition is composed of 32 teeth with 16 in each arch. Eight molars – Four molars in the upper jaw and four molars in the lower jaw. Also, during this phase, an individual will have a combination of milk and permanent teeth. Consequently, this stage is called mixed-stage. Also Read: Facts About Teeth Human Teeth Diagram The given diagram of human teeth shows different types of teeth in humans. This anatomical diagram depicts a cross-sectional view of a human molar tooth, comprehensively illustrating all major structural components from the crown to the supporting periodontal tissues and alveolar bone. Understanding dental anatomy in detail is fundamental for dental professionals, as it provides the foundation for virtually all clinical procedures, from routine restorative work to complex endodontic therapy and oral surgery. Learn everything you need to know about molar teeth, the large, flat teeth at the back of your mouth. Find out how many molars you have, where they are located, when they erupt, and how to keep them healthy.