This is what I found on RD.COM:

Got foul breath (again)? If you’ve ruled out all of the reasons you have halitosis—and you’re not making any of common tooth-brushing mistakes—don’t despair. While there are many causes behind bad breath, ranging from trivial to more severe, there is usually a simple yet reliable cure for bad breath, and it’s the last thing most people think of.

Stinky-smelling breath could be a sign you’re dehydrated, according to Dr. Ada S. Cooper, D.D.S., a national spokesperson for the American Dental Association. “Don’t think that living a life of mouth wash four times a day is always going to cure your bad breath,” she told Business Insider. “When your mouth becomes more dry, you have less saliva. And when you have less saliva, food and bacteria tends to sit in your mouth for a much longer period of time.”

She says that drinking more water every day can (almost certainly) keep the dentist away. And beware of drinking coffee or alcohol, smoking, or certain medications; all of them can cause dry mouth, Dr. Cooper says. Eating any of these 7 foods can give you seriously bad breath, too.

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Information provided by RD.COM.

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