Dr. Horace Wells, who practiced dentistry in Hartford, Conn., in the 1840s, was an early booster for the use of nitrous oxide as an anesthetic.
http://www.npr.org/blogs/health/2013/06/19/193545780/laughing-gas-gets-a-safety-check?ft=1&f=1001
http://www.npr.org/blogs/health/2013/06/19/193545780/laughing-gas-gets-a-safety-check?ft=1&f=1001
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