龋病是口腔科的常见病、多发病,是在以细菌为主的多种因素影响下,发生在牙体硬组织的慢性进行性破坏性疾病,影响病人的咀嚼和消化功能,可以引起牙髓病、根尖周病甚至全身等并发症,严重影响病人的工作、生活~([1])。龋病在发达国家呈下降趋势,而在发展中国家呈上升趋势~([1])。我国乳牙龋病发病严重,幼儿乳牙患龋对今后恒牙龋坏有一定的影响,同时乳牙龋病对儿童局部和全身都会造成不良影响。为了解河北省张家口市涿鹿县农村小学生患龋和口 Dental caries is a common disease, frequently-occurring disease, is mainly under the influence of bacteria-based multiple factors in the hard tissue of the teeth of the chronic progressive destruction of the disease, affecting the patient’s chewing and digestion, can cause teeth Myelopathy, periapical disease or even systemic complications, seriously affecting the patient’s work, life ~ ([1]). Dental caries is declining in developed countries and rising in developing countries ~ ([1]). The incidence of deciduous dental caries in China is very serious. The deciduous teeth deciduous caries have a certain impact on the future permanent deciduous caries. In the meantime, deciduous dental caries have a detrimental effect on children both locally and systemically. To learn about the caries and mouth of rural pupils in Zhuolu County, Zhangjiakou City, Hebei Province