Triad of factors determining the severity of malocclusion include:: (A) Duration, Intensity and Frequency, (B) Activity, Duration and Frequency, (C) Frequency, Activity and Intensity, (D) None of the above
Answer is A. The effects of any habit depends upon three factors:

Intensity - it is the vigor with which the habit is performed.
Duration - it is the amount of time spent on the habit.
Frequency - it is the number of times the habit is activated in a day.

Above-mentioned triad has direct cause-effect relationship with the habit.