

The largest mouth gape (female) is 6.52 cm (2.56 in), and was achieved by Samantha Ramsdell (USA) in Norwalk, Connecticut, USA, on 15 July 2021.
Not only is Samantha's mouth tall, but it is wide, too. When measured across, Samantha's mouth gape reaches over 10 centimetres, or 4 inches.