The general objective of the present investigation was to relate the presence of exogenous black pigmentations in deciduous dentition and the consumption of ferrous sulfate, in children between 2 and 5 years of age, attended at the Bellavista-Sullana Health Center. The methodology used had a quantitative approach and a non-experimental-correlational, crosssectional design. The technique to be used was the survey and clinical observation. The instruments used were a questionnaire and a graphic scheme that allowed us to record the information of the pigmented teeth using the Albelda M classification (1), both instruments were developed exclusively for this research. The population consisted of 150 children who attended the Bellavista-Sullana Health Center in the period of July-September 2021, the sample being 108 children. The study found that exogenous black pigmentations in deciduous dentition, in children aged 2 to 5 years, are manifested in 29.6% of children, showing that the majority of children (27 of 32, 84.4%) presented grade I pigmentation Likewise, it was concluded that the presence of spots is not significantly related (Sig.> 0.05), neither with the age of the child, nor with sex; In addition, I make it clear that the time that the child has been consuming ferrous sulfate, the type of presentation of said product, the daily intakes and the time after the ingestion of foods that take ferrous sulfate, are not significantly associated (Sig .> 0.05) with the presence of black spots on the adamantine surface of the children evaluated. It was also found that neither brushing to consume ferrous sulfate, nor the number of times the child was found to be significantly related (Sig.> 0.05) with the presence of black spots. Keywords: chromogenic pigmentations. Ferrous sulfate.
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