The sulphate-free Briogeo Curl Charisma Rice Amino + Avocado Hydrating Shampoo ($24-$58) can actually nudge out curls in chemically straightened hair as it cleanses and hydrates. Among the moisturising ingredients like shea butter and avocado oil, there's also tomato fruit ferment which helps hair dry evenly so curls form more uniformly (instead of parts of the hair drying faster or frizzing up first).