Commonest disease non-contagious

Periodontal diseases, such as gingivitis (inflammation of the gums) are the most prevalent of all non-contagious diseases, affecting approximately 75% of the US population, for example. Although the distribution and severity varies regionally around the world, according to the World Health Organisation 60-90% of school children and the majority of adults in industrialised countries are affected by dental diseases.
Figures are as of 2000 reports, but as up to date as possible (website checked 2004).

The most serious form of peridontal disease, peridontitis, is the largest cause of tooth loss in adults. This is despite improvements in oral hygiene.