I have had bad breath for more than 10 years. it increase with air travel even with liberal fluid intake. i have been examined by a dentist, ent specialist, internal medicine and through endoscopy. the problem is still not identified. what could be the ca

Furrowed tongue or?: Try tongue brushing and a careful exam by a dentist for leaking fillings or recurrent root canal infections.

Two questions: What is causing bad breath and why is it worse with air travel? Starting with the later. Eating food you normally don't eat and not able to clean as you would at home. Sleeping on the plan after eating. Drinking alcohol. For underlying bad breath i would look for a stomach problem such as an ulcer or for elevated blood ketones from borderline diabetes or alcoholism.

Probably dental: Bad breath-usually from food, alcohol consumption, smoking, lack of hydration, gastric problems, sinus problems, poor oral hygiene, periodontal disease or decay, bacteria on the back of the tongue. If you are careful with your diet, low alcohol consumption and maintain good hydration, your doctors have eliminated gastric ; sinus problems, you don't smoke-then it is probably a dental problem.

Your tongue: According to world famous dental expert dr. Gordon christensen, 90% of all bad breath issues are from failure to properly clean one's tongue, if at all! get a proper tongue brush, have your dentist or dental hygienist show you the proper technique, start cleaning your tongue daily and hopefully that will provide you with positive results!

Chronic bad breath: Chronic halitosis, or bad breath, has many causes. Food stuck on the back of the tongue or in pits in the tonsils,Gum disease,and dry mouth (xerostomia) are common causes.Dry air in the plane exacerbates dry mouth and the other conditions mentioned. Nervous stomach can also cause bad breath and be made worse with air travel. Air lines limit mouthwash to 3 oz. Sugar free gum or listerine tab helps.

Debridement: In addition to all the other excellent suggestions presented here I would recommend 1) brush or scrape the top of your tongue--ask your Dentist for instructions, and 2) class or Water-Pik DAILY to remove the 30% of bacteria and food debris from between your teeth that a toothbrush (should be used 2 FULL minutes by the clock at least 2x/day) cannot reach.