It depends. The BRAZILIAN SILK™ Professional Treatment is not a relaxer – it’s a FILLER. Think of it as repairing the hair versus straightening it. If your hair is wavy, the BRAZILIAN SILK™ Professional Treatment will make your hair appear naturally straight and healthy because it has added more weight by bonding keratin (the protein that makes up hair) to the hair shaft. If your hair is very curly, it will minimize frizz and loosen the curl while creating radiant shine and leaving your hair silky smooth.