Exactly the same happened to me when I was in my teens and next thing I know my dentist has drilled pretty much most of the good teeth under the name of cavity. In my 40s now and I am still paying for it as I now have to keep on visiting a dentist every year because of my constantly broken fillings. I have paid a lot out of pocket and the insurance has paid a lot on my behalf to the dentists.

The cost of each filling nets the dentist $100+ and each patient now becomes a repeat customer and serves the dental industry for life. There is no ethics in this space and it's unfortunately a BIG SCAM.