Comparative evaluation of the effects of four types of iron supplements on primary teeth discoloration: an in vitro study.

The analysis revealed a very large effect size for the change in lightness (L) in the Amivital Ferrous Sulphate group (d = 5.42) and the SiderAl group (d = 4.46), indicating a substantial and practically significant darkening of the teeth.

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While the very large effect sizes and highly significant p-values suggest that the primary findings are robust, the lack of multiplicity control is a statistical limitation.

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