send her PM under an alias and let her know. If the PM is polite, which based on your writing I think it will be, she'd understand and may even be grateful.

Remember a lot of things in this hobby can give bad breath including CIM and CBJs. Also using an alcohol based mouth rinse can dry the mouth and lead to bad breath.  

The worst I had was when a provider had peed just before the session and wiped it dry with toilet paper. I just could not DATY with the taste and smell of pee and bits of TP stuck down there.

I always make sure I have mints before I get to the door. I had one situation where the providers breath was bad, it sure effected my enjoyment. I also had one instance where the provider had to pass gas while in a specific position, killed the whole date for me  I did feel bad for her a bit.

Another thing while we are at it is when the provider does not have her nails done. In general I hate when woman does not take care of herself to look good, all the time. Thats one of the many things I love about my wife, always tries to look good, nails, hair, makeup and dress fashionably/sexy. If I'm paying good money for the ladies time the least she could do is make sure she looks her best for the date.  

/rent off

thanks for all your replies, although it seems as if there is no good advice to address the issue while you are actually in the session. After reading Amanda's reply and the fact she has fresh breath for a session, I need to see her!