User blog comment:Lightning the Skrill/Titan Dragons/@comment-24497928-20150216225242/@comment-10829013-20150217225117

It is true that the Titan Wing is referred to as a stage in a Dragons life, yes. But it is said that it is very rare. The fact that Titan Wing is said to be a stage in a Dragon's life makes no sense as Toothless was able to revert from this stage, hinting that all Dragons are able to revert back to normal. I'm not sure, but that's how I see it.