There are special fluoride gels in Germany that you must only use once per week so in the end it doesn't really change anything if you don't have access to them.
What really makes a difference is getting bio glass or hydroxyapatite or recaldent and switching between fluoride and the previous stuff once per day.
Also, cavities bacteria cannot digest xylitol so a mouth wash with xylitol will significantly reduce the presence of them. Another thing that helps against cavities is taking an oral probiotic once a year to reset your mouth microbiome.
Also another thing, the most common source of "invisible mouth pain" near the root of your teeth is either swollen gums aka gingivitis or just straight up bruxism. Of course you might also have sensitive teeth but that is a solved problem if you use hydroxyapatite.
Prescription grade tooth paste with high fluoride or prescription grade mouth wash with chlorhexidine meanwhile are not that good long term and only used for their acute treatment potential.