Many causes...: Bad breath or halitosis, can have several causes, ; it is sometimes multi-factorial. Accumulation of plaque and tartar in between ;; behind the teeth + presence of cavities are common causes. Also, many people have more accumulation of germs and debris on top surface of their tongue (to be brushed daily too). Others:presence of "post nasal drainage", acid reflux/ digestive problems ; some foods.
Answered 2/27/2017
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