Table 4 Mean values and standard deviations of oral malodor measurement, before the orthodontic treatment had started (0), and at every second month (1, 3, 5, 7, 9, 11, 13) during the treatment. Since the index levels of control group were steady during the three visits, one mean value is given

115.92^a

139.56^a

145.48^a

147.54^a

152.46^a

135.64^a

137.67^a

139.70^a

70.50

8.716

8.741

7.650

6.90

6.130

5.20

6.760

7.824

8.220