PLAQUE INDEX Using Quigley Staining Hein Method with Turesky Modification:Units on a scale 0 to 5 (0 = no plaque, 1 = separate flecks of plaque on the tooth, 2 = a thin continuous band of plaque, 3 = a band of plaque up to one-third of the tooth, 4 = plaque covering up to two thirds of the tooth, 5 = plaque covering two-thirds or more of the crown of the tooth. Plaque score = sum of all scores divided by the number of sites (teeth) scored.