English football will greatly expand research into the dangers of heading, with players from more than 10 clubs set to use mouthguards to measure the impact on their brains over the rest of this season.
Sportsmail understands a mix of first-team, Under 23 and women players will trial the PROTECHT gumshield, data from which helped inform the landmark guidelines introduced for 2021-22.
Manchester City and Liverpool last season led a study that prompted English football to introduce heading restrictions for the first time.
English football will greatly expand research into the dangers and effects of heading
It is recommended that professional players practise a maximum of 10 higher-force headers — typically from a long ball, cross, corner or free-kick — per week in training.