My roomate has bad breath.. And its not like its once in a while, its everyday.. ANd I see him brushing his teeth like 3-4times a day and he uses mouth wash too.. I think he might know he has bad breath or something.. What causes it? Hes a clean kid... I know he walks all day long, mabee it has to do with that? I want to help him, but Im not gonna come out and tell him he rotts.. What solutions are out there, and what causes it? Its funny cause like 1/2hr after he brushes his teeth I can smell it..