A lot of more realistic depictions of dragons have their fire breath coming from some sort of flammable substance like a gas or liquid that their body produces and stores before they spew it that they then light to create the illusion or at least an approximation of 'breathing fire'... somehow.

My question is this. Could/Is-it-possible-for a creature evolve to grow steel teeth, or at least steel somewhere in their mouth, and have their tongue be tipped with some sort of flint-like stone or object that they could scrape against the steel in their mouth to create the spark that would light the flammable substance?

  • $\begingroup$ Steel teeth are unlikely but not officially impossible worldbuilding.stackexchange.com/questions/214123/… Easier to steal steel from prey (human warriors). How smart are your dragons? If people can seek flint, so can a dragon. Then you just need the appropriate bifurcated tongue. Mouth is wet - how to keep things dry? $\endgroup$
    – DWKraus
    Oct 2, 2021 at 11:41
  • $\begingroup$ @DWKraus "how to keep things dry?" get xerostomia $\endgroup$ Oct 2, 2021 at 12:28
  • $\begingroup$ @AdrianColomitchi It could work, but I was a bit concerned that a dry mouth might not be the best for making the mouth protected from fire. I was actually picturing a prehensile tongue lolling out of the dragon's mouth like a puppy, holding a human set of flint and steel. $\endgroup$
    – DWKraus
    Oct 2, 2021 at 13:17
  • $\begingroup$ @DWKraus never handle a hot pot with a wet oven mitts. I reckon works for dragon mouths too, just stuff it with dry tea towels in advance; if they catch fire, spit them at the opponents. $\endgroup$ Oct 2, 2021 at 13:41
  • $\begingroup$ Use a modified syrinx with the flint & steel in then you can have normal teeth, you want them to talk? no problem, give them both a syrinx & a larynx, can animals evolve mineral deposits as part of organs etc? the already do it's cold bone, if they can lay down calcium there's no reason to think they can't lay down others, there are snails that use other metals for their shell anyway so there you go. $\endgroup$
    – Pelinore
    Oct 2, 2021 at 16:46

3 Answers 3


The Flint

Flint is a mineral; it is a sedimentary cryptocrystalline form of the mineral quartz.

Biomineralization is a naturally occurring trait of living organisms, and this is process is how seashells get formed, for example.

So, yes, your dragon is some biological manner have a “tongue of flint.” Maybe its tongue has surface that scales flint and regenerates dead tongue skin cells. Maybe your dragon’s mouth is a nice environment for the bacteria similar to the sea floor and it’s that bacteria which produces the mineralization process, which catalyzes on your dragon’s tongue.

The Steel

Biological production of steel is a bit tougher nut to crack. It doesn’t occur.

But it doesn’t need to occur. I get that you’re going after a literal “flint and steel” fire starting mechanism. But the purpose of the steel in a flint and steel kit is merely to serve as a (relatively softer) material for striking the harder flint against. It is but one, relatively later, materials used to manufacture a class of tools generally called a fire striker within the class of fire starting generally termed “percussion fire making.”

Percussion fire making involve the striking of one material against the other to cleave a small, hot, oxidizing metal particle that can ignite tinder. This contrasts other fire making methods such as volcanic ignition, meteorite strike, lightening, or friction (hand bow, etc.)

Early fire strikers, and fire making, predate the Iron Age and therefore steel. Early fire strikers were manufactured from a variety of iron pyrite. Also marcasite was used with flint and other stones to produce a high-temperature spark that could be used to create fire. For example, anthropologists believe that the "Iceman" called Ötzi may have used iron pyrite to make fire.

Marcasite, sometimes called “white iron pyrite”, is iron sulfide with orthorhombic crystal structure. It is physically and crystallographically distinct from pyrite, which is iron sulfide with cubic crystal structure.

It is a mineral, and that gets us back to mineralization. Or perhaps naturally produced teeth.

However, I would be apt to swap the two: the teeth should be the harder of the flint-and-steel mechanism, perhaps wearing somewhat over time. The tongue should be the sacrificial element, flaking off dead skin cells in the form of sparks that simply get regenerated over night.

Well, that’s how I see it anyway.


Use Ferrocerium Instead

Ferrocerium is an alloy that is used to start fires, like a flint-and-steel. However, ferroceriums are far better. Namely, their sparks burn far hotter (making it easier to light the fire), and can be sparked on many types of edge

There is one problem: Cerium (a major part of ferrocerium) is not biologically active, at least not in animals. However, there is a solution: There are a few methanotrophic bacteria that do use cerium, and it's not completely implausible that bacteria like these could help pass these metals into the dragon's bloodstream. There is also the problem of getting the cerium, but if these dragons are the subterranean type, then they could easily get it from eating the right minerals

On the specific placement of the ferrocerium, it'd be best to have regular teeth, with the metal at the sides of the tongue, like the 'teeth' of a goose. This should allow the dragon to eat and move its mouth without causing sparks and wearing down its metal-parts. The teeth should also have a rough edge on the inner face, for quick and consisent sparking

The secretion of metallic parts seems quite plausible, as many species (including every basis for a dragon) already deposit minerals into their tissues. While metals are a little different, the principle should be the same

  • $\begingroup$ A world with heavy meteor bombardment in the last few million years might have easy surface metal. $\endgroup$
    – SRM
    Oct 3, 2021 at 15:00

fork(Prehensile)-tongued dragons:

It isn't impossible for a dragon to make a metal like iron (but implausible and impractical), and it's not impossible for a dragon to have seeking behaviors to locate flint. But Why? Prior to the advent of steel, iron pyrite would and did work for a fire striker. Dragons could have seeking behaviors for iron and flint that would obtain the materials they need.

Dragons are portrayed as clever, even if they aren't fully intelligent. So let's say your dragon has a long, forked prehensile tongue. Before humans came along, dragons could have discovered flint and iron pyrite. Even if they can't think of flint and steel on their own, they can watch a human do it, and "steal steel" by simply taking flint and steel from a human.

With a tongue that can manipulate tools (and possibly direct the streams of flammable gasses), it's a simple enough task for a dragon to use it's tongue to strike flint and steel like humans do. The dragon can keep these items in it's cheek, or loll it's tongue out of it's mouth the keep them dry before use. If the iron needed to be associated with the teeth, you could simply wedge a piece of steel (or pyrite) between a couple of teeth to hold it in place.

Dragon w prehensile tongue

flint and steel


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