OCD aside. Its a sign of insecurity. If I had to guess, someone in his life told him that his breath stinks(probably someone close to him). OVer the years when he played around with diets and lowered his carbs to nothing, you can bet that his wife probably said a word or two. And lets not forget about the amount of rotting flesh that sits in his stomach on a daily basis. Some have reported protein counts being over 1000 grams a day. Add in a few tabs of XTC on a sunday hanging out in the blazing sun at REHAb and you have the makings of some breath that could cut threw steel. No biggie though, thats bodybuilding.