Table 1.

Summary of experimental conditions

Group	Presence or absence of change in tooth color	Application site	Treatment
1	Presence	Maxillary and mandibular anterior teeth	Placebo gel without hydrogen peroxide - Formula e Açao – Sao Paulo/SP
			- without activating source
2	Presence	Maxillary and mandibular anterior teeth	6.0% hydrogen peroxide –White Class with Calcium, FGM – Joenville/SC
			- without activating source
3	Presence	Maxillary and mandibular anterior teeth	7.5% hydrogen peroxide –White Class with Calcium – FGM – Joenville/SC
			- without activating source
4	Presence	Maxillary and mandibular anterior teeth	7.5% hydrogen peroxide – Oral-B 3D White, Oral-B - EUA
			- without activating source