What do you do if your SOs tongue taste bad during kissing? (Serious question)

My boyfriend is mad in a way that I, which I am embarassed about and miserably failed at, tried avoiding tongue kissing. He's now embarassed about kissing me and I don't know what to do.

His tongue just has this..I brushed my teeth but it ain't help, taste. I can't stand it sometimes and I don't know how to tell him that I don't like tongue without hurting his feelings, more than what they are. He has a lot of pride..and he loves tongue kissong. Any suggestions?