This study was conducted at 3.986 male children and 3.789 female children in some cities in Vietnam in 2010. Purpose of study: identifying the proportion of dental caries and gingivitis among school children from 4 to 8. identifying oral care activites of school children in practice. Material and method: cross-sectional descriptive study. Results: The average number of teeth with cavities or missing or filling is 4.7, mean dmft index increases with age, from 0.14 in 4 year-group to 4.14 in 5 year-group, The percentage of students having calculus is 80.8 percent, among those there areslightly more school boys than girls (81.1 percent compared to 80.5 percent)...Conclusions: the proportion of caries and periondontics is very high: 90.6 percent has debris/plaque, 81.1 percent has calculus and 11.9 percent is reported with bleeding gum. Really high percentage of children from 4 to 8 has decayed primary tooth (81.6 percent). The average number of teeth with cavities or missing or filled is 4.7, mean dmft index increases with age. The proportion of permanent tooth decay is 16.3 percent, mean DMFT index is 0.30.