Serious matter that affects both me and my boyfriend...?

I really need some help on how to clean out my . My boyfriend really loves to suck on my , I enjoy it, but the only thing keeping me from letting him do it as much as he would like is the fact that my taste horrible. I know this because he sucks on my nipples then kisses me after wards. Whenever he kisses me I taste the disgusting aftertaste and smell the foul odor on his breath whenever he talks to me. It is really embarring. I am not feeding, so it has nothing to do with milk. I also know that it involves my hygiene, but TRUST ME.... I takes many showers throughout the day, but it does not seem to be helping me in this area. So I cant seem to figure out what the issue is. I would really appreciate whatever help anyone can suggest. Thanks!