Table 2.

Mean and standard deviation of surface characteristics before and after the use of activated charcoal.

Surface characteristics		Difference (Before-After)	P-value*
Color	ΔE ΔL Δa Δb	−2.64 ± 0.61 −1.60 ± 0.73 −0.02 ± 0.22 −1.95 ± 0.65	<0.0001 <0.0001 <0.0001 <0.0001
Roughness		2.25 ± 1.39	<0.0001

*Paired T-test.