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众所周知,龋齿为口腔之多发病、常见病,每个人在幼年都有20颗乳牙,于6～14岁乳牙先后脱落更替为恒牙,恒牙为28～32颗。无论乳牙或恒牙,每颗牙齿都有切端或(牙合)面(咬合面)、唇颊面、舌腭面,近中面和远中面5个面,每个面都有罹患龋齿之可能。因此人类是很容易罹患龋齿的。龋齿为人类大敌,世界卫生组织将龋病列为当前主要防治疾病之第3位。
As we all know, dental caries for the incidence of multiple oral diseases, common disease, everyone has 20 deciduous teeth in early childhood, 6-14 years old deciduous teeth has been replaced by permanent teeth, permanent teeth for the 28 ~ 32. Regardless of deciduous teeth or permanent teeth, each tooth has a cut end or (occlusal) surface (occlusal surface), lip and buccal surface, tongue and palate, near and far in the middle 5 faces, each face has dental caries may. So humans are prone to dental caries. Dental caries is the enemy of human beings. WHO ranks caries as the third most important disease prevention and control.