Thumb-sucking: literature review.

@article{Johnson1993ThumbsuckingLR,
  title={Thumb-sucking: literature review.},
  author={Eric D. Johnson and Brent E. Larson},
  journal={ASDC journal of dentistry for children},
  year={1993},
  volume={60 4},
  pages={385-91}
}
A multidisciplinary literature review of nonnutritive-sucking habits is presented. The causes, prevalence, and risks of these habits are discussed, and factors that contribute to the severity of the habit are identified.