I'm a little concerned about my cat.

When we first got her, shortly after we had someone visit for a while who left toothpaste gobs in the bathroom sink. Not really a big deal, but the cat ... would leap up onto the sink, and eat the toothpaste. I was pretty confused, but ultimately didn't do anything because, hey, short-term guest, problem eventually over.

But last week I realized that she almost always hangs around the bathroom as I'm brushing my teeth. Once I scooped her up afterward---she's the kind of cat that usually goes for affectionate head-butting, so I went to head-butt her, and she instead swooped her face down to smell my breath. I was curious, so I exhaled at her and she apparently liked the smell of my mouthwash so much that she started purring.

I set her down on the bathroom floor and swished my mouth with mouthwash again, and as soon as I spat it out, she leapt up into the sink and started licking the residue.

I'm... kind of concerned. Ever since I realized she's been doing this, I've been really careful to rinse my mouthwash residue completely away (I grew up without fluoridated water, so my mouthwash has fluoride, and I know that can get unpleasant at high doses.) Both my mouthwash and my boyfriend's dollar-store Scope knockoff have alcohol in them, and he says she usually stalks the sink after he brushes his teeth too.

I wondered if she was just craving some mint, and got her some catnip---and she has practically no reaction to catnip at all.

Im really puzzled---has anybody been through this before, or even have a clue what might be up? Why would a cat like toothpaste and mouthwash?