Abstract
The impact of non-nutritive sucking (NNS) habits on dentofacial structures and occlusion is well proven. It has been hypothesised that NNS also effect speech due to its effect on dentition and oral musculature. However, the results of the existing studies are inconsistent, therefore this scoping review was undertaken to systemically evaluate the existing literature and to identify any research gaps. The database search resulted in 869 studies of which 861 articles were excluded as they were duplicates, irrelevant, published in languages other than English, and data were not available. The remaining 8 full-text articles were evaluated for their eligibility and were included in the present review. After the qualitative analysis of the studies, we conclude that the non-nutritive sucking is associated with speech sound disorders in children. However, the of quality of evidence is not satisfactory, more studies with detailed measures of sucking habits are needed to completely understand the effect of NNS on speech disorders.
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