My boyfriend still has bad breath even after visiting the dentist

My 33M boyfriend still has bad breath despite visiting the dentist after I told him to. It’s so bad that I can’t kiss him or even lay on his chest because it makes me sick. I really don’t know what to do after this because i thought after him going to the dentist, getting a cleaning and filling his cavities, the bad breath would be gone. Would this be a dealbreaker for anyone? Should I continue to date him even if I feel disgusted by his breath because despite that, he is a great guy. It’s just something I can’t seem to get past and it makes me really upset.