Ya'la said, concerning the one who bit (another), and his front tooth fell out, that the Prophet said: "There is no Diyah for you." (Sahih )
Sunan an-Nasa'i Book 45, Hadith 56
← Previous Hadith "Ya'la fought with a man, and one of them bit the other, who pulled his hand away from his mouth, and a front tooth fell out. They referred their dispute to the Messenger of Allah and he said: 'Would one of you bite his brother as a stallion bites? There is no Diyah for that."

Sunan an-Nasa'i Book 45, Hadith 55 Next Hadith → a man bit another man in the forearm, and his front tooth fell out, so he went to the Prophet and told him about that. He said: "Do you want to bite your brother's forearm as a stallion bites?" And he judged it to be invalid.

Sunan an-Nasa'i Book 45, Hadith 57