The main purposes of these surveys, which are carried out every 10 years, are to get a picture of the dental health of the population and how this has changed over time in order to assess changes in health and to plan for the future For example, some of the aims of the 2009 ADHS were to: Establish the condition of natural teeth and supporting tissues. Investigate dental experiences Gain knowledge about attitudes towards dental care and oral hygiene. Examine changes in dental health over time. government are Monitor the extent to which dental health targets set by the being met.