What do you suggest for bad breath that is impossible to fix?

Bad Breath: Go to: http://www.Smilesapartcosmeticdentist.Com/fresh-breath-control.Htm then see your dentist to rule out all dental causes, followed by your physician to rule out all medical causes. This needs to be evaluated by both professionals as to cause and treatment. There is generally no real "cure" but rather prevention and maintenance. You can't take a shower never to be dirty again.

Non-Dental Cause: If no dental reason can be found for your bad breath, it is possible to have a zenker's diverticulum in your neck that can retain food and cause chronic bad breath. See you dentist and your doctor as well for a complete evaluation of the problem.