Just stumbled upon bared_fangs, which appears to have started life as "bared_teeth for characters with fangs" but is now just-as/more often being tagged on posts which have any amount of fang visible , often in the style of cute_fangs. bared_teeth itself has a small amount of this but it's not approaching a majority of the tag.
At best it seems mostly redundant to bared_teeth fangsunless on separate characters while also poaching some posts which should be bared_teeth + sharp_teeth. I don't know if that's a common issue with sharp_teeth?
Considering it's currently primarily used for cute_fang I think an alias to fangs would make the most sense, which will result in those handful of sharp_teeth mistaggings going there.
Updated