Dental researchers as early as 1877 noticed that oxalic acid could be used to whiten vital teeth.
Source: Alford A, Clinical Report: The use of 10%, 16%, 22% Carbamide Peroxide and 3%, 7.5%, 9.5% Hydrogen Peroxide Materials for at-home Vital Tooth Bleaching in Combination with Active and Passive Treatment Modalities for Control of Tooth Sensitivity and Gingival Irritation, Oral Health, March 2010, Vol 100, No 3, pg 90-101.
Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)