For oral health (actually it’s a bit of a cure all). I advocate MMS.

Info:
http://video.google.com/videosearch?q=jim+humble&emb=0&aq=f#q=jim+humble&emb=0&aq=f&qvid=jim+humble&vid=948284113233997302

Purchase it: (there are MANY sources that make MMS, but this is my choice)
http://mms-lab.com/shop/

Protocol as a mouthwash:
2 drops of MMS, with 2 drops of citric acid. Make sure the drops mix, and let sit for about 30 seconds. Mix with about half a cup of luke warm water. Rinse the mouth with it for about one minute. You wont experience any plaque build up for about 24 hours. Way more affective than mouthwash and tooth paste.

Though I don’t know how affective it will be if the source of the smell is come from down the throat.

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Acid Reflux and ulcers.

http://www.mandarinconsulting.com/acid-reflux-causes-remedies.htm

I also know that eating bananas are extremely good for ulcers.

Further search reveals that bananas can be good for acid reflux specifically, but I’m reading arguments from both side of the fence. It appears to ease some GERD sufferers yet agitate others.

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I recommend fasting.

Fasting over night without dinner.

Prolonged Juice Fasting.

http://juicefasting.org

and Water Fasting.

Juice fasting is the best way to start out since you’ll burn less callories and therefore eliminate toxins at a slower rate, therebye avoiding a herx reaction.

Therefore this gives the digestive system time to heal.

I don’t know how your friend would react drinking home made juice though.

Your friend can also try water fasting. But it’s best to fast one day at a time, maybe 1 or 2 days a week about 6 or 7 times before attempting a prolonged 5-7 day fast in order to avoid a herx (healing reaction from toxin purging.)

Personally, I love fasting and I do it for the health benefits alone. The first 2 or 3 days can be tough, but as you enter the 2nd stage of the fast, you will feel AMAZING and the best you have ever felt since you were a kid, and I swear my life on that statement, so try it lol.

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I forgot, your friend also needs Vitamin C. On average EVERYONE needs atleast 1 gram a day, but in your friends case i would say atleast 2 grams.

Vitamin C is extremely important for the body.

Read this:

http://www.dummies.com/how-to/content/how-your-body-uses-vitamin-c.html

Vitamin C is essential for some proteins in the body, such as the creation of collagen fibers, the 100% Daily recommended value (DRV) is not sufficient for a healthy body, and over time leads to chronic scurvey (heart disease, cardiovascular disease and plaque build up).

Your friend may also benefit from L-Lysine which is an essential amino acid.