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.
Oyster Bay was originally part of Queens County, until New York City was amalgamated in 1898, and the eastern portion of Queens County was added to the newly formed Nassau County in 1899. More recently, the town exchanged territories with the Town of Hempstead and the Town of Babylon between the 1990 and 2000 censuses.