Studies have shown that when your dentist marks "poor oral hygiene" in your chart 3 or more times during orthodontic treatment, that it correlates to an increased treatment time of 1.2-2.2 months.
Source: Brown D et al, Systematic Evaluation of Patient Oral Hygiene for Orthodontic Patients, Oral Health Journal, Sept 2009, Vol 99, No 9, pg 52-58.
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)