The broken ones need to be replaced, obviously
The others maybe just sanded and cleaned, really hard to tell how bad the chip in the end is...
But
The bone, if that is what they are is as fragile if not more fragile then the horn (?????) was, so taking them apart might cause another set to be needed..
Looks like you have a bit of work to do there
Mod Edit: Moved thread to the Workshop where you will get even more help about doing this