I've suffered for years. nothing really worked and it was depressing since I brush my teeth daily.
here is what you have to do, move your own finger on the back of your tounge from side to side then smell your finger immediately if it smells , then congratz, you can get rid of the bad smell for good.
google really helped and now I wish I could kiss my self all the time since I don't smell anymore :D
this the best article:
Treatment for bad breath associated with the tongue
If you are in good general health, have healthy teeth and gums, and your oral hygiene is good, then the most likely cause of your bad breath is a bacterial coating on the back of the tongue. The following routine may be performed once a day, preferably in the morning, however performing this routine at night not only reduces morning breath, but will make your bed partner MUCH happier.
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The first step in the treatment of bad breath (fetor oris) caused by bacterial coatings on the tongue is simply vigorous scraping using either a tongue scraper or, probably just as good, an inverted spoon. In effect, you are not only removing the mucous layer, but are giving your tongue a "haircut". It is necessary to scrape the top surface of the tongue very vigorously, almost as far back as the circumvallate papillae located at the very back of the tongue. (Note: there are numerous types of tongue scrapers. The type pictured on this site is probably the most popular because it was the first on the market. Other types are acceptable as well.)
If you slide your finger over your tongue toward the back of your throat, you can feel the circumvallate papillae, which form a "V" shaped line across the posterior dorsum (top surface) of the tongue. It is important to scrape the top surface of the tongue nearly as far back as these papillae. Do not scrape the circumvallate papillae themselves. It is normal to gag during this process, however, persistence pays off, and the gagging subsides over time as you get used to it. Gagging has a huge psychological component, and you can learn to overcome it. Remember, the scraping must be vigorous enough to give your tongue a "haircut", but not so vigorous that you cause pain or bleeding. If you look at (or smell) the material that you scrape off the tongue, you will see why there is so much potential for bad breath from it.
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After you have scraped your tongue, the second step in the treatment of fetor oris is to disrupt the actual volatile sulfur compounds as well as the anaerobic bacteria that remain after scraping. This is easily accomplished by gargling or vigorously brushing the tongue with a 1.5 percent solution of hydrogen peroxide (available in any drug store). Hydrogen peroxide liberates oxygen. That is why it bubbles up when it comes into contact with bacteria or blood. The hydrogen peroxide you buy at the store is a 3 percent solution. It is generally wise to dilute the peroxide solution half and half with water in order to gargle with it, however you may prefer to apply 3% hydrogen peroxide directly to the tongue using a tooth brush. Vigorous brushing with hydrogen peroxide will help to further remove the bacterial layer while at the same time oxygenating the area. Use copious amounts of peroxide. The hydrogen peroxide solution accomplishes two simultaneous operations:
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The oxygen liberated by the hydrogen peroxide combines with the VSC's thus neutralizing them and effectively removing the chemical compounds immediately responsible for the bad breath.
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The oxygen liberated by the hydrogen peroxide kills the anaerobic bacteria responsible for producing the VSC's.
Hydrogen peroxide is cheap and very effective in both neutralizing VSC's, and in killing anaerobic bacteria, but it tastes terrible, which is why you may want to rinse your mouth afterwards with a commercial mouthwash, or use Peridex®, which is available by prescription, instead of peroxide. Listerine (the original type) is also effective in killing the anaerobes and neutralizing VSC's.
http://www.doctorspiller.com/halitosis.htm
DON'T use any mouthwash that contains alcohol, it's gonna dry ur mouth and sometimes make the problem worse.. hydrogen peroxide it's effective , very effective.
and as the article says, it's gonna suck at first to brush the back of the tounge but with time it will get better.
