I'm a moron

So it turns out that the lady who is sensitive to toothbrushes gets anaphylaxis from nylon, and my understanding was that toothbrush bristles are probably nylon. I react hard to vinyls and most polyesters, so I would have noticed those, but nylon I don't detect.

This lady appears to react to pretty much everything including cotton, and she's given up trying to find soap she tolerates. I think in her position I might give up on my teeth, too, but I'll look into natural fibers and wood and see if she can't handle some of those.