I promised a non-dentistry case and I think this one is really nice and maybe helpful too.
the horse presented very lame and painful in the area of the toe, but we coudn‘t find an abscess. usually we don‘t need x-rays for most abscess cases, but we wanted to make sure it‘s not a coffin bone fracture. in the third pic I marked the little „hole“ on the x-ray, can you see it? we put a needle deeper first, before cutting a bigger hole (the first pic from the hoof was after that, you can see the pus on the hoof) and if you look on the testing probe, you can see how deep inside it was.
take home message: usually hoof abscess cases don‘t need antibiotics and sometimes a needle can help you if you‘re not sure what‘s beneath the horn. sometimes you cut the hoof to look for the painful abscess, you find a place with soft horn and you‘re not sure if you will find just blood or pus - put a needle in it, so you can find out before cutting the hoof horn completely away on this spot - we always try to remove just as much horn as necessary, so the horse has a fast recover. can you see the pus inside the needle on the photo?
I hope you find that helpful too, although it‘s not dentistry all the time
the horse got some nsaid and a hoof dressing afterwards. nsaid I try to use not before it was possible to open the abscess, and as I said, no ABs necessary.