My boyfriend’s breath smells like poop. It makes me not want to kiss him. What should I do?

Oftentimes I really don’t want to kiss him but I do not want to hurt his feelings. He’s very sensitive to any slight idea of rejection from me especially not wanting to kiss but I’m not exaggerating it smells like sh*t. Some days he doesn’t brush. He’s gone down on me before & just threw on clothes & went right to work afterwards I’ve mentioned it he’ll temporarily do better then repeat he has so much cached up gunk on his teeth I’m scared he’ll cause me some health issue.
My boyfriend’s breath smells like poop. It makes me not want to kiss him. What should I do?
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