Oral health of children
This section provides the latest information about oral health of children living in fluoridated and non-fluoridated areas in New Zealand. Fluoride in drinking-water helps to prevent and reduce tooth decay.
Two measures of children's oral health are:
- percentage of children who are caries-free
- the lifetime experience of dental decay - measured as the number of decayed, missing or filled teeth, in primary teeth (dmft) or permanent teeth (DMFT).
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Children living in communities with fluoridated drinking-water generally had better oral health than children living in non-fluoridated communities.
In 2015, around 59 percent of 5-year-olds were caries-free in their primary teeth. Rates were slightly higher in fluoridated communities (60 percent) than in non-fluoridated communities (59 percent) (Figure 1).
More Māori and Pacific Island 5-year-olds were caries-free in fluoridated communities than in non-fluoridated communities in 2015. The largest difference can be seen for Māori children.
5-year-olds had on average 1.8 decayed, missing or filled primary teeth in 2015. Children living in fluoridated communities had less decayed, missing or filled teeth than children living in non-fluoridated communities (Figure 2).
This difference is particular large for Māori children. 5-year old Māori children had on average 2.5 decayed, missing or filled teeth in fluoridated communities compared to 3.3 decayed, missing or filled teeth in non-fluoridated communities in 2015.
Similarly, children in Year 8 (12–13-year-olds) were more likely to be caries-free in their permanent teeth if they lived in fluoridated communities (62 percent) than in non-fluoridated communities (61 percent) (Figure 3). This difference was particularly seen for Māori children.
Children in Year 8 had on average 0.9 decayed, missing or filled teeth in 2015 (Figure 4). 12-13-year old children living in fluoridated communities had in general less decayed, missing or filled teeth than children living in non-fluoridated communities.
In 2015, the Capital and Coast district health board had the highest percentages of caries-free 5-year-olds and Year 8 children. Around 70 percent of children were caries-free in this region.
In general, children in the South Island were more likely to be caries-free than children in the North Island (Figure 5 and Figure 6).
Figure 5: Percentage of 5-year old children that are caries-free, by District Health Board (DHB), in 2015 (hover over a DHB for mean dmft and caries-free percentages)
Figure 6: Percentage of children in Year 8 that are caries-free, by District Health Board (DHB), in 2015 (hover over a DHB for mean DMFT and caries-free percentages)
Between 2000 and 2015, the percentage of children that were caries-free increased. Improvements can be seen in non-fluoridated as well as fluoridated communities.
The percentage of children in Year 8 that were caries-free increased from 42 percent in 2000 to 61 percent in 2015. In the same time frame, the percentage of 5-year old children that are caries-free increased from 52 percent to 59 percent.
Between 2000 and 2015, the mean number of decayed, missing or filled permanent teeth of children in Year 8 dropped from 1.6 to 0.9 teeth. The mean number of decayed, missing or filled primary teeth of 5-year old children increased between 2000 and 2007, from 1.8 to 2.3 teeth. However, the number has decreased since 2008 and is now at the same level as 2000 (dmft of 1.8)
In general, children that live in communities with access to fluoridated drinking-water had a lower mean number of decayed, missing or filled teeth.
In New Zealand, the community oral health service collects oral health data for 5-year-old children and children in Year 8 (12–13-year-olds) .
For more data, go to the Ministry of Health 's oral health data and stats webpage.
- Ministry of Health. (2017). Oral health data and stats 2015. URL: http://www.health.govt.nz/nz-health-statistics/health-statistics-and-data-sets/oral-health-data-and-stats/age-5-and-year-8-oral-health-data-community-oral-health-service (accessed April 2017).