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河北柳虹问:我爷爷今年75岁,平素身体健康,全口无牙已多年,并已戴全口牙托(假牙)。最近突然发现他左下颌磨牙区又长出“新牙”。请问,老人为何会长”新牙”? 答:人的一生有两副牙齿,即乳牙和恒牙。乳牙20颗,婴儿6个月左右开始萌出,2岁半前后出齐。恒牙28～32颗,6岁时萌出第一磨牙,故称“六龄牙”。7岁左右乳牙脱落换恒牙,12～13岁除智齿外,全部恒牙出齐。如保护得当,恒牙可陪伴终生。
Hebei Liu Hong asked: My grandpa is 75 years old this year and I am generally healthy. I have been toothless for many years and I have worn a full denture (denture). Recently suddenly found his left mandibular molars area and grow “new teeth.” Excuse me, why the elderly president of “new teeth”? A: The human life has two pairs of teeth, that is, deciduous teeth and permanent teeth. Teeth 20, infants about 6 months began to erupt, 2 years and a half before and after Qi. Permanent teeth 28 ~ 32, 6-year-old eruption of the first molar, so called “six-year-old teeth.” 7-year-old deciduous deciduous teeth for permanent teeth, 12 to 13-year-old addition to wisdom teeth, all the permanent teeth out of Qi. If properly protected, permanent teeth can accompany life.