Sunan an-Nasa'i, Volume 5, Book 45, Hadith 4770 (DarusSalam)

It was narrated from Safwan bin Ya'la, from his father, that: a man bit the hand of another man and his front tooth fell out. He came to the Prophet but he considered it in vain.

أَخْبَرَنَا عَبْدُ الْجَبَّارِ بْنُ الْعَلاَءِ بْنِ عَبْدِ الْجَبَّارِ، عَنْ سُفْيَانَ، عَنْ عَمْرٍو، عَنْ عَطَاءٍ، عَنْ صَفْوَانَ بْنِ يَعْلَى، عَنْ أَبِيهِ، أَنَّ رَجُلاً، عَضَّ يَدَ رَجُلٍ فَانْتُزِعَتْ ثَنِيَّتُهُ فَأَتَى النَّبِيَّ صلى الله عليه وسلم فَأَهْدَرَهَا ‏.‏

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