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 Brook Township is a township in Somerset County, New Jersey, United States. As of the 2010 United States Census, the township's population was 7,203, reflecting an increase of 1,549 (+27.4%) from the 5,654 counted in the 2000 Census, which had in turn increased by 1,194 (+26.8%) from the 4,460 counted in the 1990 Census.