´It was narrated from Ya'la and Salamah the sons of Ummayah said:` “We went out with the Messenger of Allah (ﷺ) on the military expedition of Tabuk, and with us was a friend of ours. He fought with another man while we were on the road. The man bit the hand on his opponent, who pulled away his hand and the man's tooth fell out. He came to Messenger of Allah (ﷺ) demanding compensatory money for his tooth, and the Messenger of Allah (ﷺ) said: 'Would anyone of you go and bite his brother like a stallion, then come demanding compensatory money? There is no compensatory for this.'” Hence, The Messenger of Allah (ﷺ) invalidated it (i.e compensatory in such case).
Hadith Referenceسنن ابن ماجه / كتاب الديات / 2656
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده حسن
1؎: This is because his tooth did not fall out due to his own fault; had he not bitten, the other person would not have pulled his hand away. And when he bit, what else could the poor man do? In the end, it was necessary for him to free his hand.