Teeth count as ivory. You can make a lot out of them at the crafting workshop.

To mod them to disappear, you'd have to either make all teeth disappear, or individually mod the sentients whose teeth you cant use.

You cant use normal teeth for anything, but yeah it is true that they are counted as ivory, which I do understand makes it hard to mod given that anything you do to teeth you do to Ivory as well. A mod would have to separate teeth from ivory as a material probably

You'll need to manually patch the vanilla files to do this. Go to

\Dwarf Fortress\data\vanilla\vanilla_materials\objects\material_template

find [MATERIAL_TEMPLATE:TOOTH_TEMPLATE]

Anywhere in the template add [ROTS]

If done properly, every unprocessed tooth item (so, just teeth lying around) will rot away like soft tissue, except with no miasma.

You can do this with other material templates that compose bodies, by the way. It is likely to make whole corpses disappear.

Yeah I already added ROTS to it but it still takes a bit long and they still haul the teeth etc. At that point I can use a smasher or magma to get rid of them so it doesnt help much, the idea was for teeth to just basically instantly evaporate or something after leaving the creature so you dont need to haul 1000 teeth in the first place.

I've got a feeling what you're asking for can be resolved by unassigning invader teeth from your refuse stockpile.

But at that point, teeth would rot and create miasma in interiors if they have the ROTS tag, or stay there permanently if not, either way its not great

At some point, you got to take what you can get.
Some things are hardcoded and needs memory hacking which is much more difficult to do than straight up modding.

If don't want to rely on modding due to the modding capabilities being insufficient in regard to what you want to accomplish, you might want to learn memory hacking, because there aren't a lot of people in this community who can pull it off since memory hacking isn't about modding games, but rather programming as a whole. Not even that may guarantee the results you're looking for.

There are some ways to also alter game source code, but that is pro level stuff and doesn't seem worth it due to the time investment.

If you go the rot route, also add the no miasma tag.

If you don't mind getting rid of teeth entirely just change their material to evaporate at room temperature, melting point:10000 they should vaporize the moment they leave the mouth