An index that evaluates the plaque revealed on the buccal and lingual non-restored surfaces of the teeth on a scale of 0 to 5, defined by G. A. Quigley and J. W. Hein in 1962 and modified by S. Turesky, N. D. Gilmore, and I. Glickman in 1970. All teeth except the third molars are assessed. An index for the entire mouth is determined by dividing the total score by the number of surfaces examined.
Quigley–Hain plaque index
Isolated flecks of plaque at the gingival margin
A continuous band of plaque up to 1mm at the gingival margin
Plaque greater than 1mm in width and covering up to one third of the tooth surface
Plaque covering from one thirds to two thirds of the tooth surface
Plaque covering more than two thirds of the tooth surface