CSB - Concussion Research Scientist Janelle Romanchuk

Mouthguards that light up when a player sustains a significant head impact will be used at this year's women's Rugby World Cup, which starts next week.

The mouthguards, which use LED lights, will flash red if the impact is severe enough to potentially cause a concussion.

The referee will then stop play with the player sent off for a head injury assessment.

The mouthguards will be introduced to the men's Rugby Championship next year.

NZR's Concussion Research Scientist Janelle Romanchuk joins the show to discuss the new innovation.