TABLE 3. Mann Whitney U test for the consumption frequency of possible staining agents reported by the adolescents.

Food/beverage	G1 Mean (SD)	G2 Mean (SD)	p
Colored Snacks	2.00 (0.30)	2.57 (0.28)	0.194
Chocolate	2.58 (0.30)	2.89 (0.32)	0.499
Juices	3.67 (0.32)	3.40 (0.33)	0.623
Coca-Cola®	3.64 (0.27)	3.37 (0.23)	0.264
Other soft drinks	3.00 (0.33)	2.80 (0.30)	0.477
Coffee	3.69 (0.43)	4.77 (0.36)	0.037*
Tea	1.03 (0.26)	0.46 (0.17)	0.075
Colored seasoning	2.67 (0.47)	3.34 (0.46)	0.233

^*Significant (p < 0.05)