Why B’desh batter Shakib has a band between his teeth while batting

Former Bangladesh captain Shakib Al Hasan is using an innovative technique involving a black band between his teeth to improve his batting stance and head position in the first Test against India. Commentator Aakash Chopra explains that this method helps the left-handed batsman Shakib in keeping his head aligned with his right shoulder, aiding in better front-foot movement.