Nothing protects teeth better than tartar. Once you get some tartar on you, nothing can get through it. It protects your teeth from germs and from scratches. Ideally, your entire tooth surface would be covered with this stuff.
The only problems are: (1) tartar itself contains germs, and (2) tartar
But, instead of trying to get rid of tartar once you have it, the goal should be to bleach it and sterilize it. In this way, dentists can help you keep the protection without any risk to your dental health.
For those unlucky people who don't have tartar, I propose a toothpaste that is made of a mild solution of synthetic tartar (clean and sterile). This toothpaste, when applied every day for two months, will shield your teeth so well that you will still have a full set even if you live to be 120.