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Poor brushing of teeth linked to premature cancer deaths as bacteria increase risk by up to 80%   By JENNY HOPE PUBLISHED: 23:43 GMT, 11 June 2012 | UPDATED: 23:43 GMT, 11 June 2012 Failing to brush your teeth properly could increase the risk of dying prematurely from cancer, researchers claim. They found a link between high levels of dental plaque, or bacteria, and dying from cancer up to 13 years earlier than might otherwise be expected. Those with the most bacteria on the surface of their teeth and gums had an 80 per cent increased risk of premature death.  Be thorough: Brushing your teeth badly can raise the risk of cancer, according to the latest research Researchers say infection and inflammation play a role in up to one in five cancers, and is a key element in gum disease caused by dental plaque. Gum disease causes bad breath, bleeding gums and, if untreated, cavities, receding gums and tooth loss after plaque settles between teeth and under the gumline. It has been linked to chronic health problems including heart disease, thought to be caused  by inflammation passing from the gums into the bloodstream, although US researchers have recently suggested the link may be coincidental.