I say no too. From when I was a child, the topical fluoride treatment would make me sick for days. Of course, the adults didn’t believe me. At that time, they had a tray with gel and stuck it in your mouth. From that point on I’d be sick and queasy. A couple of years ago this hygienist started applying fluoride despite my confirming with everyone there several times that I didn’t want it. As soon as she started painting it on, I had that telltale sickness and stopped her immediately and told her I expressly said I don’t want it. She immediately rinsed and had me spit it out. My dentist said the reason they used to apply it after cleaning was because of abrasive cleaning methods that they don’t really use anymore. Her office supposedly only uses it if specifically requested.

But for me, the type of fluoride they add to water and in dentistry is bad. Naturally occurring fluoride would be ok imo. I use a zero water filter to remove fluoride and chlorine, amongst other things. Then I add my own mineral drops from salt water lakes back in to soften and improve flavor.