Zac Efron's face has undergone significant changes over the years, primarily due to a serious accident in 2013 that broke his jaw. After falling and hitting his chin against a granite fountain, he required reconstructive surgery and his jaw was wired shut. During recovery, the masseter muscles (jaw muscles) worked overtime and grew larger, altering his facial structure. This resulted in a wider, more chiseled jawline, more prominent cheekbones, and a more mature, sculpted look. Zac has consistently denied having cosmetic plastic surgery, attributing his changed appearance to the injury and his body's natural compensation during healing and physical training for acting roles, especially for his role in the 2023 film The Iron Claw where he gained substantial muscle mass. Fans and media have noticed his transformation from a softer, youthful face to a more angular, muscular appearance, but Zac himself has stated his look is due to the accident and physical changes rather than voluntary cosmetic procedures.