Yes. Although there is no law specifically outlining advance care directives, the Brazilian Ministry of Health has regulated palliative care in SUS through Normative No. 41 (2018). In this regulation, advance care directives are considered for all people with any life threatening disease, including dementia (Brazilian Ministry of Health, 2019b).

References:

Brazilian Ministry of Health. (2019b). Cuidados Paliativos no SUS. Ministério Da Saúde.