The incidence of paresthesia (loss or altered sensation) after the injection of an anesthetic is about 1 out of 785,000 (very low).
Source: Garisto G et al, Occurrence of Paresthesia After Dental Local Anesthetic Administration in the United States, PEAK, Royal College of Dental Surgeons of Ontario, May/June 2011.
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)