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Bad hair days may be over, with scientists hoping to develop a pill to make hair straighter or curlier.

Australian researchers have discovered the gene that causes curly hair.

They are developing a treatment that could spell the end of hair straighteners.

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The discovery will also make it possible to predict if a baby will have straight or curly hair.

And it may even help police, with DNA found at the scene of the crime indicating how wavy a suspect's locks are.

The Queensland Institute of Medical Research team identified the trichohyalin gene as being responsible for creating hair curls.

Although it was known to play a role in the development of the hair follicle, the scientists have discovered its role in hair curliness.

Researcher Professor Nick Martin said a variation in the gene determined the straightness or curliness of hair.

It may be possible to come up with treatments to make hair straighter rather than relying on heated hair straighteners, he said.

"Potentially we can now develop new treatments to make hair curlier or straighter, rather than treating the hair directly," he said.

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