Cavities are the end of a long process: bacteria metabolize sugar, produce acid, and pull minerals out of enamel. Early demineralization looks like a chalky white spot and can still be reversed. Once the surface collapses into a hole, only a dentist can repair it.
Fluoride and hydroxyapatite both rebuild early lesions. Pick one and use it twice daily without rinsing afterward.
Six sips of soda across a day is worse than one glass. Every exposure restarts a 20-minute acid attack.
It starves the bacteria that cause decay and stimulates protective saliva.

Fluoride-free hydroxyapatite paste for daily remineralization.

Hydroxyapatite-infused biodegradable flossers in strawberry.

Plastic-free toothpaste tablets with 10% nano-hydroxyapatite.
Early demineralization can remineralize. An actual hole in the enamel cannot — that needs a filling.
No. Spit, don't rinse. Leaving the paste film on your teeth extends the remineralizing effect.