When a person skips meal, the salivary glands cease to work, thus, the increase in bacteria which cause bad breath. When a person does is dieting, he produces a chemical known as keto acids. High concentration of keto acids is called ketoacidosis. This has a distinctive fruity odor which is as well considered as bad odor. In line with this, other volatile oils are incorporated into dental products nowadays to create similar effects. Among these are the myrrh, tea tree oil, caraway, clove, bloodroot and sage. If, however, you are more of the health conscious person you could try to intensify your vitamin intake. Since bad breath roots from bacterial production in the mouth, you should focus on vitamins that could hamper the production of these microorganisms. Some include those with non-oral origins and others are related with psychological disorders. Halitophobia, an interesting condition is marked by the presence of compulsive ideas that constantly plague the thoughts of a person, for whether he truly has bad breath or not. In fact, this imagined condition is graver than normal bad breath since patients of this disorder are likely to contemplate on suicides. Poor oral hygiene can result to the increase of anaerobic bacteria that break down sugar and protein from the food particles left inside your mouth, particularly in between your teeth and at the back of your mouth. This would then result to the production of volatile sulphur compounds (VSCs), which would then be the cause of bad breath. However, thus must be an integral part of any oral hygiene practice this would largely determine the presence of absence of bad breath. Again, oral bacteria are the culprit in here. Those that survive in the surface of the tongue along with the food debris that are left exposed on eth surface would contribute to the formulation of bad breathe. There are 4 major causes of bad breath in children: xerostomia, periodontal diseases, nasal infection, and poor oral hygiene. 1. Xerostomia (dry mouth). Dry mouth breeds bacteria. Bacteria break down sugar and protein to produce byproducts called VSCs or volatile sulphur compounds. VSCs cause bad breath.