'More and more' - The unusual cosmetic step Man City star has taken to improve athletic performance

Josko Gvardiol is hoping treatment to straighten his teeth will be his secret weapon in leading Manchester City to glory again this season.

The Croat was advised by physiotherapists to undergo Invisalign orthodontic treatment to improve his jawline in a bid to improve his posture and balance. The £77million left-back completed the correctional work at the Dentum clinic in Zagreb, in his native country.

And he considers it an important part of his development plan after speaking about his desire to improve on his debut season with City, which saw him lift the Premier League trophy.

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Orthodontic specialist Katarina Krajacic, one of the team overseeing Gvardiol’s treatment, said: “More and more athletes are seeking support from orthodontists and posture specialists in order to improve their performance.

“When the upper and lower teeth don’t come together properly because of the size or positioning of the teeth and jaw, it’s called malocclusion.

“This impacts your ability to chew, your oral health and the appearance of your smile, but it also plays a role in your posture, which can make a big difference to an athlete’s performance.

“Many studies have found a direct connection between malocclusion and postural body stability, and it is an area that is increasingly being explored by athletes determined to improve."

Invisalign is an increasingly popular orthodontic treatment that uses clear, removable plastic braces to correct teeth placement and improve smiles. It can cost up to £5,000 and can take between three to 18 months to complete, depending on the