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Reasons

Another negative side effect of not brushing one's teeth is halitosis or bad breath. According to the American Dental Association, not brushing properly allows remnants of food to collect on the teeth, gum line, and the surface of the tongue. Tooth plaque leads to gingivitis and periodontitis bacteria build-up, which produces bad-smelling odors. Having bad breath is very common, and most people experience it, but not brushing one's teeth particularly increases the risk. The ADA states that properly brushing teeth to remove bacteria that contribute to oral odors will improve oral hygiene and keep breath smelling as fresh as possible.