论文部分内容阅读
人的一生要长两次牙,先长出来的是乳牙,后长出来的是恒牙,一般来说小孩到两周岁时20个乳牙就长全了.乳牙的骨质比恒牙的脆弱得多,最怕酸类物质腐蚀.而奶糖一般是发软发粘的,孩子们在吃糖的时候,往往会在牙齿间隙或沟缝内留存一些残糖,这些残糖经过口内的细菌作用,很快就会转化成为酸性物质.另外,一般工厂在制糖过程中,为了促进蔗糖的转化和调剂
People’s life to grow two teeth, the first out of primary teeth, after the growth of the permanent teeth, in general, two children aged 20 to complete the primary deciduous teeth. Deciduous bone than permanent teeth fragile More, most afraid of acid corrosion, while the toffee is generally soft and sticky, children eat sugar, tend to keep some residual sugar in the gap or groove of the teeth, these residual sugar through the mouth of bacteria , Will soon be transformed into acidic substances.In addition, the general factory in the sugar process, in order to promote the transformation and transfer of sucrose