Mouthguards that light up to indicate a player has suffered a significant head impact will be used at the Women's Rugby World Cup, officials announced Monday.

Mouthguards will flash red if the impact is severe enough to potentially cause a concussion. The referee will then stop play and the player will leave the field for a head injury assessment.

The aim is to introduce the system into all top-flight rugby.

Dr Eanna Falvey, the chief medical officer at World Rugby, said every player at the Women's World Cup, which starts on August 22, will wear the mouthguards, apart from two who wear braces.

He added that in the men's game around 85 percent of players wear so-called "smart mouthguards", which are not compulsory.

The mouthguards measure how much a player's head moves and rotates in a

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