Deciduous teeth 20 in number, ten teeth in each mandibular and maxillary arch Deciduous central incisor deciduous lateral incisor deciduous canine first deciduous molar, second deciduous molar in each quadrant Upper II mⅣ V total20 Lower jaw in. in. can. mol. mol Eruption: stars at about 6 mouth of age and continues to beginning of 3rd year Shedding: occurs between 6th and 12th years with replacement by permanent teethDeciduous teeth ◼ 20 in number, ten teeth in each mandibular and maxillary arch ◼ Deciduous central incisor , deciduous lateral incisor , deciduous canine , first deciduous molar ，second deciduous molar in each quadrant Upper jaw Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ total 20 Lower jaw in. in. can. mol. mol. ◼ Eruption: stars at about 6 mouth of age and continues to beginning of 3rd year ◼ Shedding: occurs between 6th and 12th years with replacement by permanent teeth Ⅱ Ⅳ