How to Get and Use Enderman Teeth
Enderman Teeth are the mod's core crafting material, so farming them early pays off. They drop from most of the biome-specific enderman variants rather than vanilla endermen, so you need to hunt the mod's mobs specifically.
Farming Teeth Safely
Build a simple two-block-high killing shelter near a spawn area for the variant you want (for example, a cave, desert, or snowy region at night). Bring a looting-enchanted sword to improve drop counts. Water buckets and boats do not work on most variants the way they do on vanilla endermen, so rely on the height trick instead.
What Teeth Are For
Teeth are used in crafting the Corrupted Blade, Corrupted Shield, and several hood items. Check the recipe book in-game (or JEI/REI) after picking one up — the recipes unlock automatically once you hold a tooth. Save a stack before spending them, since corrupted gear recipes often need multiple teeth plus a pearl.
Practical Tip
If a variant is hard to reach (End Islands, Soul Sand Valley), trade with other players or set up a spawn-proofed farm in that biome rather than trekking back and forth. Teeth stack, so a single farming session can supply all your corrupted gear.