Can a dragon's breath kill White Walkers?

We don't know. And let's not get confused: Wights and White Walkers are not the same thing. Wights are the reanimated corpses, and White Walkers (more commonly called Others in the books) are the "head honchos," the supernatural ice beings like (on the show) our friend the Night's King. read more

The only two weapons, known in the GoT contemporary world to kill White Walkers are valyrian steel and dragon-glass, both reportedly considered to be made up of dragon fire and dragon poop, respectively; so wonder, what dragons itself will do to them, to the Others. read more

Ok, so I'll differ with all the answers here (till now). I highly doubt if dragon fire can do any harm to the white walkers. So basically, there are three types of those white creatures- Whights Which were created by the Night King. read more

Many of us Game of Thrones fans probably never saw ourselves sobbing over the death of a mythical creature before season seven's sixth episode, "Beyond the Wall," when we see the death of one of Daenerys's dragons at the hands of the Night King. read more