Sounds like we all get it... I have really good dental hygene (mostly because I hate having to go to the dentist!) I brush, floss, use a mouth rinse and breath freshener... and I STILL get it!

I mostly get it when I have a cold... but if I am somewhere where, heaven forbid, I forget my toothbrush, floss and mouth rinse... I get them.

So it might be either allergies or you need to brush and floss, ect.