Table 1. Whitening efficacy values expressed by the difference of shades (ΔSGU) between baseline (T0), after first use (TI), and continuous use (TCU) of toothpaste.
| Time of use | Toothpaste | Mean | Standard deviation | Coefficient of variation | Median |
|---|---|---|---|---|---|
| TI | B&W | 0.00 | ±0.54 | 0.00 | 0.00 |
| WAD | 4.60 | ±5.08 | 1.10 | 4.00 | |
| LWA | 4.40 | ±5.58 | 1.27 | 0.00 | |
| TA (control) | 1.60 | ±1.99 | 1.25 | 1.00 | |
| 3DW | 2.67 | ±2.47 | 0.92 | 3.00 | |
| XW4D | 1.87 | ±3.20 | 1.71 | 0.00 | |
| TCU | B&W | 7.40 | ±3.14 | 0.42 | 6.00 |
| WAD | 7.20 | ±2.73 | 0.38 | 9.00 | |
| LWA | 9.00 | ±4.72 | 0.52 | 10.00 | |
| TA (control) | 2.47 | ±2.75 | 1.11 | 1.00 | |
| 3DW | 8.80 | ±3.57 | 0.41 | 11.00 | |
| XW4D | 5.93 | ±1.22 | 0.21 | 6.00 |