http://en.wikipedia.org/wiki/Procaine
www.top3dentists.com/blog/2010/11/history-novocaine/
http://umm.edu/health/medical/drug-notes/notes/procaine-injection
directionsindentistry.net/dental-mythbuster-4-dentists-still-use-novocaine
www.top3dentists.com/blog/2010/11/history-novocaine/
http://umm.edu/health/medical/drug-notes/notes/procaine-injection
directionsindentistry.net/dental-mythbuster-4-dentists-still-use-novocaine