Taiwanese dentists have urged fast food chains to drop over-sized hamburgers from their menus following a growing number of jaw injury cases.

Patients have developed sore jaws or had difficulties opening their mouths after consuming giant burgers, the China Post quoted professor Hsu Ming-lung of the School of Dentistry at National Yang-Ming University as saying.
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Problems can arise when fast-food fans tuck into hamburgers larger than (three inches) high, Hsu said. A human mouth is designed to gape over objects measuring only up to four centimetres.
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