In a trial to compare a stannous fluori de dentifrice (A) with a commerciall y available fluoride-free dentifrice (D), 270 children received A and 250 recei ved D for a period of 3 years. The nu mber x of DMFS increments (i.e., the number of new decayed, missing, an d filled tooth surfaces) was obtaine d for each child. Do the results provid e strong enough evidence to suggest a real effect of fluoride in reducing th e mean DMFS?Results were: Dentifrice A: ₁ = 9.78 SA = 7.51. ₁ = 12.83 SD = 8.31. Dentifrice D:

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A:

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