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What is The fourth dimension of habit as described by Pinkham: and explain in detail?
Triad of a Habit
The deleterious effects produced by a habit depends upon the three factors – Duration, Frequency & Intensity.
 a. Duration: The amount of time spent indulging in the habit. 
 b. Frequency: The number of times the habit is activated in a day.
 c. Intensity: The vigor with which the habit is performed.
Key Concept:
Pinkham has added a fourth dimension to oral habits, ie., Direction.