I find specific foods/drinks (e.g. orange juice) somewhat unpleasant after toothpaste, but not to the extent that I would refrain from consuming them if hungry! Is this strong reaction perhaps connected to your anosmia in some way?

I suppose that's not impossible; I imagine toothpaste would affect the taste aspect of flavour more than the smell aspect, and since the former is all I have it would make reasonable sense for the effect to be more pronounced.

I've never until today had the faintest idea that my reaction wasn't pretty much universal, however. This is interesting.

Adrian brushes his teeth before or after breakfast, he doesn't care, and I don't like to eat too soon after brushing my teeth. As I think I mentioned, I have slight anosmia. This seems to be slight corroborration, but only very slight.