Yes there is it is called fluoride.

Have you checked out the Weston Price website?

http://www.westonaprice.org


I am sure that diet is the most important factor in building healthy teeth, as it is through what we eat that our nutrition (the building blocks of teeth) and our pH levels are established.
And it's not just about calcium. If it were, most would have healthy teeth now, as people drink milk, milk shakes and smoothies, and eat yoghurt & cheese like there's no tomorrow - at least they do here in Australia and in the movies I watch, the Americans are constantly eating cheese burgers ....
With mineral-deficient soils, resulting in mineral-deficient foods, combined with the habit of eating fast-foods and revving oneself daily up with stimulants (e.g. caffeine which in itself depletes our nutrition reserves), it's no wonder our teeth show the signs.

Seekers of health inevitably discover the dangers and myths of fluoride, as they delve deeper. Anyone pushing fluoride has an agenda or is still ignorant.

I don't know if herbs can remineralize/repair teeth but know that some exert strong antibacterial action. I brush with oregano oil (diluted) and bicarbonate of soda, or I use a herb-based commercial toothpaste. Other herbs such as mint, thyme, cloves, tea-tree and cinnamon have an antibacterial effect. There are ayurvedic toothpastes too, that are fluoride-free and taste good for kids.

The Senior Citizens had poor nutrition in home. When tooth was loose it was bad for their health.

For weak teeth eating something hard to exercise helped.
Eating apples and carrots.

Tincture of walnut extract maybe?
I heard walnuts extract is good for the enamel of the teeth by restoring.