I am bringing this up again, I would bump the old post but I cant find it. Anyways I think that bared_teeth -> clenched_teeth should be unaliased because it is possible to bare teeth without clenching them. Here are some examples of posts that would fit perfectly to bared_teeth tag but definitely not to clenched_teeth tag:
post #227793 post #382299 post #202460

I totally agree with you. I thought you were initially asking for them to be aliased and I was just preparing my fingers for the absolute shit storm of words I was about to hurl at you.

https://e621.net/forum/show/87748

Unaliased. This should have been done a long time ago. Cleanup will be needed.