Table 3.
Measured peroxide content and label accuracy of delivered teeth whitening products sold online.
| Sample ID | Product name | Measured Hydrogen peroxide concentration (% (mean ± SD |
Calculated Carbamide peroxide concentrationa (%) (mean ± SD) |
Labeled Carbamide peroxide concentration (%) | Relative deviation (Actual/Labeled |
|---|---|---|---|---|---|
| A | Teeth whitening kit 4 × 3ml | 3.13 ± 0.08 | 8.85 ± 0.22 | 44 | −79.9% |
| B. | Teeth whitening kit 6 × 3ml | 3.01 ± 0.05 | 8.51 ± 0.15 | 44 | −80.7% |
| D | Bleach refill gel 1 × 10ml | 16.98 ± 0.67 | 47.97 ± 1.89 | 44 | +9.0% |
| F | Expertwhite Extreme Whitening gel 4 × 3ml | 16.38 ± 0.49 | 46.28 ± 1.38 | 44 | +5.2% |
| Sodium percarbonate concentration (%)b | |||||
| C | Smile Science Harley Refill Kit 2 × 5ml | none | none | n/a | n/a |
a
Carbamide peroxide (CP) contains 35.4% by weight of hydrogen peroxide (HP), formula for calculation is CP HP x 2.824 [24].
b
Sodium percarbonate contains 32.5% by weight of hydrogen peroxide.