Table 1.

Mean diffusion coefficient slope and penetration depth extrapolated by linear and non-linear regression of the atomic content curves.

Toothpaste/Elements	Slope			Penetration Depth (μm)
	Si	P	Ca	Si	P	Ca
Free	―	0.30 ± 0.03	0.30 ± 0.06	―	―	―
Biorepair	1.10 ± 0.05 & −2.08 ± 0.02	−0.63 ± 0.01 & 0.42 ± 0.01	−0.37 ± 0.01 & 0.29 ± 0.01	6.91 ± 0.92	16.10 ± 0.75	15.64 ± 0.68
F1400	−0.27 ± 0.01 & −0.40 ± 0.01	0.26 ± 0.03	0.14 ± 0.01	13.03 ± 0.69	―	―
F500	−0.59 ± 0.01 & −0.59 ± 0.01	0.11 ± 0.02	0.09 ± 0.01	14.78 ± 0.81	―	―

p < 0.01 statistical significant difference between experimental and theoretical data fitting.