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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 | 1 | Mean Difference (IV, Random, 95% CI) | Subtotals only | |
| 1.1 6% HP gel ‐ 14 days | 1 | 49 | Mean Difference (IV, Random, 95% CI) | 3.08 [2.28, 3.88] |
