I use Fluoridex because it is the only toothpaste recommended by the University of Southern California Dental School. I have no way to independently verify that it is better than the others, but trust USC.
Fluoridex is recommended by the University of Southern California Ostrow School of Dentistry, where I was a patient. I bought it based on the recommendation and have been pleased. Am now into my third tube.
My dentist started me on this product a number of years ago and it seems to work. I haven't had any cavaties since. I do have regular checkups and I know that is necessary. It's kind of hard to find on the internet so I'm glad to find "Dental Stores" and the price is great. I'll continue to use them.