Is it guaranteed that I will get citizenship after residency of 4 years?

No one can 100% guarantee that, and although it's not a complex process, it might take a little longer than that. We know of cases when the authorities request more info. documents etc .. but it’s very rare for people to be rejected, and even if they are, they can apply again for citizenship later. In any case, we are proud to say that Establish Brazil so far has a 100% success rate, with zero clients rejected and hundreds approved.