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Means and standard deviation of ΔL*, Δa*, Δb*, ΔE, and t test results of the groups
| ΔL* | Δa* | Δb* | ΔE | |
|---|---|---|---|---|
| NanoHAP | 0.93 ± 1.03 | 0.84 ± 1.71 | 3.17 ± 1.69 | 3.94 ± 1.63 |
| Toothpaste | 1.40 ± 1.35 | 0.30 ± 0.94 | 4.39 ± 1.11 | 4.91 ± 0.99 |
| P value* | 0.29 | 0.03 | 0.02 | 0.06 |
*t test results
