PURPOSE: to evaluate children and teenagers musing hearing aids, investigate the benefit provided by sound amplification, through the Portuguese Sentences Lists Test and a benefit assessment questionnaire for children and teenagers; and to check the correlation between the results obtained from these two instruments. METHOD: 13 children and teenagers, between eight and 14 years old, both sexes, with a moderately severe hearing loss as the maximun level on the best ear, hearing aids users bilaterally for more than ten months and fitted by a Hearing Health Program were evaluated. An anamnesis was applied, then the subjects were submitted to a basic audiological evaluation, and were evaluated by the Portuguese Sentences Lists Test and a benefit assessment questionnaire for children and teenagers. RESULTS: the results obtained from the Portuguese Sentences Lists Test and the questionnaire showed the subject's benefit with the use of the hearing aids, both in silence and in noise. However, there was no statistically significant correlation between these two instruments. CONCLUSION: although statistically significant correlation has not been verified between the results obtained using two assessment instruments, through the Portuguese Sentences Lists Test, the individuals had improvement in the performance of speech recognition, using the hearing aids, both in quiet and in noise, and in response to the questionnaire, the subjects reported benefit with the use of sound amplification.