Hey.
Aloe Dent is my go to. Fluoride and SLS free. Good range and affordable.
https://optimah.com/collections/aloe-dent/products/aloedent®-whitening-fluoride-free-toothpaste
Euthymol, second option, more widely available, Fluoride free but has some other stuff, tastes like dentist rinse.
https://en.m.wikipedia.org/wiki/Euthymol
As others mentioned, low sugar diet and good hygiene essential. But then that still applies for fluoride heads too.
No shortcuts, proof of work!
PV 💜⚡