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Table 2 Plaque index (PI) codification

From: Oral hygiene compliance in orthodontic patients: a randomized controlled study on the effects of a post-treatment communication

0 No plaque
1 Discontinuous band of plaque at gingival margin identified just by a probe
2 Visible but moderate band of plaque at the gingival margin and at the tooth surface
3 Copious amount of plaque covering 2/3 or more of surface