GA Periodontics-OMG Perio OMG Perio is a specialty periodontal practice located in the heart of downtown Hamilton and the Mississauga medical district. Both offices have abundant free parking and are easily accessible by city…... Contact No. 905-276-1222 77 Queensway W, Mississauga, ON L5B 1B7 MON-FRI : 10:00 AM-06:00 PM Book Appointment