For your Brazilian smoothing to be effective for as long as possible, you will need to follow a few care principles:
Right after your at-home styling session, don't wash your hair for one to three days. This is the minimum time needed for the keratin to set well on your hair. During these first days, do not use accessories such as barrettes or headbands.
Avoid too aggressive shampoos and daily hair treatments. Look for sulphate-free treatments because sulphate is known to release keratin from hair.
Avoid the sun and the salty sea air! Instead, opt for a straightening when you return from your vacation to maintain maximum results