It is incorporated in some home-made toothpaste recipes, although I haven't a clue why teeth would need embalming.

I hazard a guess that it is not meant for the teeth but more for the gums, to make them firm and healthy. Any periodontist around?

Quite timely to be discussing lavender since they are now fragrantly in bloom in my garden. So it was named that after its use was known. I wonder what they called it before that.