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ImageNow you really can light up the room with your smile – thanks to a new trend for LED teeth that's sweeping Japan.

The mouth insert lights up when the wearer opens their mouth, providing a glowing smile, reports the Daily Mail.

The LED teeth can even be controlled by a remote, which allows you to change the colour.

The device can be affixed at the back of the teeth (a bit like a mouth guard) and lights up when you smile.

Japanese schoolgirls have already pounced on the product, which is being advertised as a 'party in your mouth', and demand has gone through the roof.

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