1. Full‐mouth scaling versus control: change in probing pocket depth.
| Tooth type: single‐ or multi‐rooted, or both | Baseline pocket depth (mm) | Time (months) | Number of studies (participants) | Mean difference (95% CI) (random‐effects meta‐analysis) | Heterogeneity |
| Both | 5–6 | 3/4 | 6 (177) | –0.05 (–0.19, 0.09); P = 0.47 | P = 0.97; I² = 0% |
| Both | > 6 | 3/4 | 7 (193) | –0.04 (–0.29, 0.21); P = 0.77 | P = 0.66; I² = 0% |
| Both | 5–6 | 6/8 | 3 (88) | –0.14 (–0.45, 0.18); P = 0.39 | P = 0.85; I² = 0% |
| Both | > 6 | 6/8 | 4 (104) | –0.16 (–0.60, 0.28); P = 0.48 | P = 0.41; I² = 0% |
| Single‐rooted | 5–6 | 3/4 | 1 (16) | 0.63 (0.29, 0.97); P = 0.0002 | Not applicable |
| Single‐rooted | > 6 | 3/4 | 0 (0) | Not estimable | Not applicable |
| Single‐rooted | 5–6 | 6/8 | 3 (69) | 0.16 (–0.01, 0.32); P = 0.06 | P = 0.89; I² = 0% |
| Single‐rooted | > 6 | 6/8 | 2 (53) | 0.26 (–0.21, 0.73); P = 0.27 | P = 0.64; I² = 0% |
| Multi‐rooted | 5–6 | 3/4 | 1 (16) | 1.00 (0.41, 1.59); P = 0.0008 | Not applicable |
| Multi‐rooted | > 6 | 3/4 | 0 (0) | Not estimable | Not applicable |
| Multi‐rooted | 5–6 | 6/8 | 3 (69) | 0.21 (–0.14, 0.55); P = 0.24 | P = 0.06; I² = 64% |
| Multi‐rooted | > 6 | 6/8 | 2 (53) | 0.18 (–0.26, 0.62); P = 0.42 | P = 0.42; I² = 0% |
CI: confidence interval.