Do I tell her that it stinks?

[Jasperkiss5]

Ok, my newly single friend has Asked me to set up a double date with my partner and his mate. This may sound awful but her breath absolutely stinks to high heaven. I'm worried that the date won't go down well if he cottons on.

But how the hell do put this across to her? Without being obvious like here's a mint.

I worked with someone who had this problem, he ended up having his tonsils removed as he had tonsil stones which resulted in recurring tonsillitis and bad breath.