No affiliation but I've been enjoying using the combination of OTC products recommended by Dr. Ellie Phillips: xylitol + CloSYS Ultra-Sensitive rinse + the cheapest Crest toothpaste + Listerine + ACT anti-cavity. She has a really interesting and I think non-typical educational background: https://drellie.com/about/

Note: other posts here have mentioned some of the medical concerns regarding xylitol so you'll need to do your own research and weigh risks but this suggested combination could be a place to start