I have been in a relationship with my partner for almost 2 years.  He is a very kind and considerate man, however his breath smells like rotten fish.  I have sat him down and tried to delicately tell, and bought him mouthwash (which he rarely uses) and suggested he see his dentist, and also brush his teeth more and floss (which he doesn't).  I even suggested he visit his dr. to see if it is health related. When we are in the car and and he opens his mouth, It is all I can do not to gag. Needless to say, I am not comfortable kissing him.  It has affected our sex life as well.  I'm really turned off by him.  What should I do?