Prevalence of oral health diseases and undernutrition are among the top diseases among school-age children. The explored how extraction of severely decayed teeth impacts on weight gain among underweight children. The study used the Scale of Oral Health Outcomes (SOHO-5) questionnaire to assess the subjective oral health indicators experienced by children. It was revealed that extraction of severely decayed tooth yielded a decrease on subjective oral health outcomes which was associated to weight gain.