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每一个人从婴儿至成人,先后会长出两副牙齿,即乳牙与恒牙。乳牙一般自出生后6个月开始萌出,最晚至2岁半出齐,共20颗;恒牙一般从6岁开始长出,至12岁基本出齐,共28颗～32颗。很多幼儿爱吃甜食,点心、糖果,种种小食品,甚至饮用水也都是带有甜味的。孩子年龄小,还不会刷牙,久而久之,食物残渣长时间积存在牙缝中,经过发酵产生大量乳酸,使乳酸杆
Everyone from infant to adult, will grow two teeth, that is, deciduous teeth and permanent teeth. Deciduous teeth generally eruption from 6 months after birth, up to the age of 2 years and a half, a total of 20; permanent teeth generally grow from the age of 6 to 12 years old, a total of 28 ~ 32. Many young children love to eat sweets, snacks, sweets, all kinds of snacks, and even drinking water are also sweet. Children are young, not brush your teeth, over time, food residue accumulated in the teeth for a long time, after fermentation to produce large amounts of lactic acid, so that the lactic acid lever