Board Thread:Skyrim/@comment-109.100.129.191-20140331060102/@comment-26662848-20150202220029

What I meant was, is that if you wanted to cure your Lycanthropy using the heads, there was only two chances in which you could do this.

- First time (Curing Kodlak of his Lycanthropy. Last quest in Companion questline)

- Second and last time (After curing both Farkas and Vilkas in sidequest)

If you did not cure yourself in either of these instances, you cannot cure yourself again using the Glenmoril witches head unless you use console commands. No matter how long you wait, the option to burn a witches head in the blue flame will never appear.