Copy Right-He Fudan University Permanent teeth 32 in number Sixteen in each mandibular and maxillary arch Two incisors, one canine, two premolars and three molars in each quadrant Upper jaw1 2 4 567 8 total 28-32 Lower jaw I in. in. ca. premo. molars First permanent molar-appears at about 6 years Third molars(wisdom tooth)-many erupt at any time after 12 years of age or not at all (impaction) Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan UniversityCopy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan University 32 in number Sixteen in each mandibular and maxillary arch Two incisors, one canine, two premolars, and three molars in each quadrant Upper jaw 1 2 3 4 5 6 7 8 total 28-32 Lower jaw in. in. ca. premo. molars. First permanent molar －appears at about 6 years Third molars (wisdom tooth) －many erupt at any time after 12 years of age or not at all (impaction). Permanent teeth (adult):