The Prophet (ﷺ) said to the man bit him: If you wish that you give him control over your hand and he bites it, and then you drive it away from his mouth (you may do it). He imposed no retaliation for his teeth.
Sunan Abi Dawud Book 41, Hadith 92
← Previous Hadith On this father's authority, said: A servant of mine fought with a man and bit his hand and he drew away his hand. (One of) his front teeth fell out. So he came to the Prophet (ﷺ) who imposed no retaliation for his tooth, saying: Do you intend that he leaves his hand in your mouth so that you crunch it like a male camel ? He said: Ibn Abi Mulaikah told me on the authority of his grandfather that Abu Bakr (ra) imposed no retaliation on him for it, saying: May his tooth go away!

Sunan Abi Dawud Book 41, Hadith 91 Next Hadith → On his father's authority, said that his grandfather reported the Messenger of Allah (ﷺ) said: Anyone who practises medicine when he is not known as a practitioner will be held responsible.

Abu Dawud said: This has been transmitted by al-Walid alone. We do not know whether it is sound or not.

Sunan Abi Dawud Book 41, Hadith 93