RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Ogre tooth
The Old School RuneScape Wiki also has an article on Ogre tooth.

The Ogre tooth is a quest item from the Watchtower quest. After killing Gorad, players receive his tooth.

When Gorad is killed, the text states "He's dropped a tooth, I'll keep that!".