Fig. 3

QIT-S scores at inner and outer surfaces. Scores of 0–5 indicate that 0–5 sextants were brushed for at least 1 s (brushing of less than a second is considered as neglect of the respective sextant). Score 6 indicates that every sextant was brushed for at least 1 s but less than 3.5 s, while scores 7 and 8 indicate brushing of 3.5-5 s and 5-7.5 s, respectively. A score of 9 was given when all sextants were brushed for at least 7.5 s. Usual: brushing as usual; best: brushing to the best of one’s abilities. *p < 0.05