This article aims to discuss the work of the professional of speech, language and hearing sciences in the context of telemarketing. The central focus is the debate about the precariousness of work in this field and its implications on worker's health. Initially we discuss the main ways of the organization of work in capitalism, followed by some elements concerning the precarious work and its relation to health, focusing the telemarketing companies' situation. It is also presented and discussed the main actions performed by speech, language and hearing professionals in this sector, which, in general, tend to reproduce the Occupational Medicine based on Taylor's model. Finally, it is argued that these professionals can change their work and their actions according to a Comprehensive Care Network of Occupational Health, from the perspective of Worker's Health Surveillance, and not to the traditional services which tend to legitimize the precarious work. Thus, we seek to strengthen the role of Brazil's National Health System in the worker's comprehensive care and overcoming this way of organization and management of work.