I feel for you, Rainbow. Dental costs are insane! My boyfriend's mom took antibiotics during pregnancy and my boyfriend grew up with damaged teeth. Crowns, etc. so expensive. Big money.

I take a lot of meds and have fillings from my younger years. No cavities or crowns as an adult yet. I always have a beverage with me (no sugar). If I wake up in the middle of the night, I take a sip so my mouth isn't dry. I do this all day, too.

I'm a big fan of flossing and Listerine. I love the Listerine burn, lol. Give it a shot. Glide is my favorite floss. Once you get into the habit of flossing, your mouth won't feel clean without it.

I just bought a Sonic Care electric toothbrush and love it.

I know this doesn't help your current situation but maybe for the future?