According to 1999-2004 survey in the United States, the mean dfs for children 2-8 years was 3.7, although for 6-11 years of age was 4.30 and 1.84 for dft. The same study reported 51.17% caries prevalence in primary dentition for 6-11 years old children. However, caries experience for permanent teeth was 21% while DFS index was 0.65. Additionally, a prevalence of 10.16%, 0.19 DFT and 0.29 DFS were reported in children from 6 to 8 years old (Dye, et al., 2010; National Institute of Dental and Craniofacial Research, 2011).
In 2004, 5 years-old children in the United Kingdom showed a 1.55 dmft, later in 2009, 33% from 12-years-old children had a mean DMFT>0 and the decay experience average was 0.74, showing that the proportion of children without decay has risen to 61% (Drugan & Downer, 2011).
Reports from Varmland, Sweden indicate that 76% of 6 years-old children are caries free in primary dentition, while 7,8,9 and 10 years old children were 98%, 96%, 94% and 92% caries free for permanent dentition, respectively. (Axelson, 2004). In Europe, some reports have indicated a 79-93% dmfs or DMFS, or equal to zero (Marthaler, et al., 2004)
In 2001, caries prevalence in Chinese children aged 5-6 years was 78 -86%, and dmft was 4.8 - 7.0. A lower prevalence of caries was reported (41-42%) in 12 years old children, and a 0.9% DMFT, according to WHO criteria (Wong, et al., 2001).
The results of this study, showed a high caries prevalence and also higher dmft, dmfs, DMFT and DMFS index compared with well developed countries such as United States, United Kingdom, Sweden and other countries in Europe, but similar to those in China.
It seems that the efforts to diminish dental caries through the evaluated preventive and educational program have do not had the expected impact though these children are under salt fluoridation program. It is necessary to reconsider the implementation of additional measures according to caries risk group as has been reported previously, as well as to evaluate the cost and the effectiveness of mouthwashes.
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