or example, why do we just counter the fact that pregnancy takes its toll on our teeth by offering free dental treatment on the NHS, rather than some protective or preventative measure like a supplement to stop damage occurring in the first place?
... really? 
I somehow had some illusions about pregnant women in the developed world getting recommendations on calcium supplementation, etc.
But then, not much surprised. Someone clearly makes more money with treating the damaged teeth than the supplement industry does with the supplements.
(Animal medicine is very interesting, in general. Horses, too, there's things known about horses that you think they'd know about humans, but don't.)