The Bloody Worm Tooth is a Pre-Hardmode, Expert Mode-exclusive accessory obtained from the Treasure Bag dropped by The Perforators. It grants 5% increased damage reduction, 5% increased melee damage, and 5% increased melee speed when equipped in an accessory slot. The bonuses are doubled when below 50% life. The damage reduction will stack with the damage reduction of the Worm Scarf.
If the player lives in a Corruption world, defeating The Hive Mind for the first time will allow the Dryad to sell the Bloody Worm Tooth.