do you think that with such knowledge now toothpastes would mean no dentist?

The point is that we do not need dentists only for cavities or other bad-diet induced diseases. Most times, especially when we are younger, our mouth and teeth develop in a bad way and that is why we need braces sometimes in our early years. Or the growth of wisdom teeth cannot be kept controlled by a toothpaste, you need a dentist to take them out if they start bothering. Unfortunately we will always need dentists for one reason or the other. Sure new toothpastes can reduce our need to visit them, but for that also a good dental higiene is enough :)