How do I tell my boyfriend he got stanky breath without sounding rude and disgusted?

Anonymous
No judgment and hatred here. I have never seen him brush his teeth ever and being an RDA I know he is at high risk at periodontal disease and teeth rotting.. but also I am his girlfriend, I am not assertive at all- I absolutely hate it and I try to avoid awkward situations like this but his breath is so bad.. I don’t know if it’s a texture thing or he doesn’t like the feel of it all I don’t know, but I need advice!
How do I tell my boyfriend he got stanky breath without sounding rude and disgusted?
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