Figure 1 - Prevalence of plaque and calculus in dentate adults
From the following article
Adult dental health survey:
The oral cleanliness and periodontal health of UK adults in 1998
A J Morris, J Steele & D A White
British Dental Journal 191, 186 - 192 (2001) Published online: 25 August 2001
doi:10.1038/sj.bdj.4801135
