What uses can a dragons fire breathing be put to?

Setting fire to forests

Heating water, metal etc,

Burning things,

Killing things...

Why do you even want to know this?! :D

I agree. Why do you want to know this?

Anyway, it was probably developed as a defence mechanism. It may later have been used as a hunting technique, but the only good thing that could come of this would be to kill bacteria.

Although we must admit that the probability of Dragon's existence is unlikely, it is possible they existed at some point in time in some form.

Healing and creating. You are all a bunch of sickos.