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