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Talk to Vilkas and Farkas while you have the remaining Glenmoril Witch Heads in your inventory. It will open up dialogue options for you to get quests to cure them of their Lycanthropy. When you cure the second brother of his Lycanthropy you can use the remaining Glenmoril Witch Head to cure yourself. This will be your last opportunity to cure your Lycanthropy and you can never become a Lycan again if you do.