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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Tooth whitening ‐ assessed by the dentist | 2 | Mean Difference (IV, Random, 95% CI) | Subtotals only | |
| 1.1 9.5% HP strip versus 10% HP strip ‐ day 9 | 1 | 29 | Mean Difference (IV, Random, 95% CI) | ‐1.5 [‐2.33, ‐0.67] |
| 1.2 6% HP strip versus 10% HP strip ‐ 15 days | 1 | 35 | Mean Difference (IV, Random, 95% CI) | 0.68 [0.16, 1.20] |
