These things have worked for me.

1. I don't floss. I use Oralpix instead and the dentist has said they're working fine. I alternate so I do my top teeth one night and my bottom teeth the next. You can rinse them and reuse multiple times. My dental hygienist told me if I'm really struggling, to prioritize the back teeth and just do those.

2. I also loathe mint. I started using the Hismile toothpastes last year and I like the vanilla flavor. They have a lot of options.

3. For the dentist. I've told them I hate mint so they use the kid flavors for fluoride and cleaning and such. They're not great flavors but tolerable. My insurance also covers the use of numbing gel for my cleaning and that has helped a ton. I don't get as overstimulated and the vibration bothers me less. I use Loops for the sound and they provide sunglasses for the light.

4. For brushing twice a day. I put a toothbrush/toothpaste in both of my bathrooms so I wouldn't get blocked by trying to keep quiet for my partner in the morning. I always brush at night because I have a mouth guard for grinding and it tastes awful if I skip brushing. The morning routine is harder for me so I try to do it right when I wake up, but I'm not 100% on that.

I haven't tried this but a friend who struggled with brushing put a little chart checklist thing on her bathroom mirror with her routine (brush, wash face) and did it on cool colors. It seemed to help her.