In the quest for silky smooth hair, two treatments that have gained popularity are cysteine hair treatment and hair botox. Cysteine works by restructuring the protein bonds in the hair, giving it a sleeker look, while hair botox is a deep conditioning treatment that focuses on repairing damaged locks. Both treatments offer lasting results, but cysteine has a longer-lasting effect of up to six months compared to hair botox’s 3-4 months.