Please help. My papa’s breath is so bad that I don’t want to kiss him.

Yesterday was our second date. The first time, his breath was noticeable but still bearable, so we went to a hotel. Even then it smelled bad, so I held my breath and did my best when we kissed, but... However, yesterday his breath was unbelievably bad from the moment we started eating. It was so awful that I felt nauseous. It smelled like feces, and since it was lunchtime, I could see my papa’s face clearly in the bright light. I couldn’t help thinking that this man in his 50s had really bad skin, and his teeth were full of silver fillings and yellow stains. I thought, “It would be stranger if this didn’t smell.” His breath was so bad that I even made excuses to refuse kissing him at the hotel. We arranged to meet again before we parted, but I’m worried about what I’ll do if his breath smells like feces again next time, and I’m wondering what excuse I can use to refuse a kiss. If people tell me, “Just cut that old guy off!” then that would be the end of it, but I have no choice but to keep seeing him for the money. I’m a newly registered Type B member, and I’ve received offers from other people too, but I haven’t found a monthly arrangement yet. Until I can secure a stable income, I want to somehow keep this man’s allowance coming. Last time, I made up the ridiculous excuse, “I ate garlic with some clients for work yesterday, so I’m worried my breath might smell. I can’t concentrate on kissing, so let’s just French-kiss today!” If his breath smells bad again next time, what excuse should I use to turn him down? Also, why do older men’s breath smell so bad?? It’s not the kind of smell caused by garlic, not brushing their teeth, or anything like that. Could you tell me how to deal with bad breath caused by aging, and how I can bring it up with this man without hurting his feelings?