Is It Necessary to Prepare the Enamel before Dental Bleaching?

Table 4

Means and standard deviations for the values.

Groups
Control
Fluoride
CPP-ACP
Nd:YAG laser + fluoride

Different uppercase letters indicate statistically significant differences within columns.
Different lowercase letters indicate statistically significant differences within rows.
Error between groups = 0,55.
Error intragroups: = 0,42.
, alfa 0,05.