Alex, see if you can find some Oregano Juice. It is some harsh tasting stuff, but did the trick for me, and helped me hang on, when I was to the point I felt I needed "committed". It was recommended by my dentist, before my removal, and I still use it, expecially when I feel sickenss coming on. It has great antiseptic and antiviral properties.

Have him hold it in his mouth, straight, as long as he can stand it, and then swallow. It tastes awful at first, but gradually you get used to it. If he takes it before bed, it will help him sleep better!!! I get it at my local healthfood store, but you can order online, too. This is what I take:

http://www.mothernature.com/shop/detail.cfm/sku/59061