This condition is called Halitosis Evaporation, which is characterized by an unpleasant smell coming out of the mouth. This case raises panic and embarrassment when people leave the bad impact with others and the situation develops a fear in an individual called Halitophobia. Mechanism of occurrence: Occurs as a result of fermentation of leftovers by aerobic and anaerobic bacteria that fills the oral cavity. This provides these bacteria with the right humidity and temperature for this fermentation to occur. Causes: There are localized factors such as poor oral health as the existence of cavities in the teeth, pockets and gum infections, infections of the mouth tissue, bleeding, dental abscesses, calcareous deposits, after surgery in the mouth in addition to smoking is an important factor in bringing about the foul smell of the mouth. It occurs also, due to dry mouth as the lack of saliva secretion results in bad smell, uncleaned tongue surface, which contains the clustered buds, including fermented food waste. As for the general or the external factors like bleeding in lungs bring bad smell when exhaling or consumption of alcohol, garlic, onion etc., in case of a diabetic patient, respiratory infection, tonsillitis, sinusitis and nasal polyps, as well as disorders of the stomach and intestine.. Diagnosis of the situation: Ask the patient to close his mouth and breath through his nose. If the smell disappears, then the reason is mouth. Complete this test and ask the patient to close the nostrils and breathe through mouth to find oral reasons if any. The doctor should take some of the waste accumulated between the teeth and on the surface of the tongue for examination and also examine nose. Methods of treatment: 1 - Treatment of dental caries and abscesses 2 - Treatment of gingivitis and periodontal pockets and removal of calcareous sediments periodically in the dental clinic 3 - Brushing teeth at least twice in a day with antibacterial toothpaste containing Triclosan as the majority of pastes do not contain this, but Colgate Total does. 4 - It is recommended using dental floss to remove food debris between the teeth 5 - It is necessary to clean the surface of the tongue while brushing from back to front to remove the waste accumulated on its surface. 6 - It is recommended to use chewing gum containing Cinnamon, as Cinnamon contributes to killing half of the mouth germs as more than 40% of anaerobic bacteria are responsible for the smell of the mouth. Dr. Faaiz Abu Ghazal Dental Surgeon