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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 18% CP 2x versus 18% CP 4x ‐ 1 week | 1 | 69 | Mean Difference (IV, Random, 95% CI) | 1.39 [0.50, 2.28] |
| 1.2 18% CP versus 16.4% CP ‐ 2 weeks | 1 | 93 | Mean Difference (IV, Random, 95% CI) | ‐0.70 [‐2.21, 0.81] |
