1913 Event 1st U.S. dental hygienists course forms, Bridgeport, Ct 1907 Event Gold dental inlays 1st described by Wm Taggart, who invented them 1875 Event William Bonwill, patents dental mallet to impact gold into cavities 1875 Event Electric dental drill is patented by George F Green 1867 Event Robert T Freeman is 1st black to graduate from Harvard Dental School 1867 Event 1st U.S. dental school, Harvard School of Dental Medicine, established 1848 Event M Waldo Hanchett patents dental chair 1844 Event 1st dental use of nitrous oxide, Hartford, Ct 1841 Event Alabama becomes 1st state to license dental surgeons 1840 Event Organization of American Society of Dental Surgeons founded in New York 1840 Event Baltimore College of Dental Surgery, 1st in U.S., incorporated 1834 Event 1st U.S. dental society organized (NY) 1806 Birthday Chapin Aaron Harris, U.S., found America Society of Dental Surgeons 1769 Birthday Horace H Hayden, cofounded 1st dental college
