No need to put it down, try to reposition the mouth shut or tape it up. My oscar once tried eating an oto and while doing my own surgery on him i messed up his mouth but I repositioned it and though somewhat crooked, he can still open and close now that it's healed. The mouth/jaw will heal, the question is how funny it will look (appearance), that's up to you. Try to make it so he can use it at least to some degree.