According to the National Center for Voice and Speech, almost one in every five people diagnosed with voice strain are teachers.
The cause: Constant strain on the vocal cords and the all-too-frequent need to speak loudly to be heard.
The remedy and prevention: Drinking water often and trying to rest one's vocal cords at night...plus avoid whispering, clearing one's throat excessively, and speaking outside a normal tonal range.
My question: What about the effects of chalk dust or fumes from markers?
Source: AP Bulletin, November 16, 2008