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. 2010 Feb 4;2009:928306. doi: 10.1155/2009/928306

Table 1.

Mean tooth shade values by group and tooth type at baseline and after 5 and 10 treatment applications.

Baseline 5 applications 10 applications (final)
N Mean S.D. Mean S.D. Mean S.D.
GROUP I 16 7.5 1.4 6.0 1.7 4.7 1.9
GROUP II 16 7.3 1.5 5.6 1.4 4.8 1.9