<p>CAL changes during the 24-month follow-up period are separately illustrated by the CAL at baseline and by the type of tooth surface. Baseline CAL values are divided into three groups: (A) <3mm; (B) 3 mm; and (C) > 3 mm.</p> <p>─●─: Maxillary molar, ---■---: Maxillary premolar, ···▲···: Maxillary anterior,</p> <p>─○─: Maxillary molar, ---□---: Maxillary premolar, ···△···: Maxillary anterior</p> <p>Baseline CAL values of < 3mm gradually deteriorated, while baseline CAL values of > 3 mm improved. Molars with a baseline CAL of 3 mm progressed, whereas premolars and anterior teeth were stable or improved.</p> <p>CAL: clinical attachment level.</p
