Normal size opening is mostly based on body size. You are quite small, so 41mm may be your normal size opening. However, betel nuts are known to cause trismus (reduced opening) of the mouth. Use the 3-finger test (above) to determine if you are achieving your maximum opening.
Brown County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 248,007, making it the fourth-most populous county in Wisconsin. The county seat is Green Bay. Brown County is part of the Green Bay, WI Metropolitan Statistical Area.
Green Bay's population was 104,000 at the 2010 census with a population density of 2,288 people per square mile (883/square kilometer).The urban area has a population of 206,000 while the metro area has 312,000 residents, which makes it the 158th largest in the U.S.