It’s safe to say I’m sold on TikTok’s DIY leave-in conditioner, but I was interested to know what the experts think of it. First of all, it pays to know what you’re dealing with. “Leave-in conditioners are designed to nourish and hydrate the hair throughout the day,” explains Diego Miranda, session hairstylist and Maria Nila ambassador. “Common ingredients include jojoba oil, aloe vera, honey, avocado oil, moringa oil, olive oil, or shea butter,” which are known to impart shine, reduce frizz, and make hair softer. Celebrity hairdresser Luke Benson adds that the main benefit of leave-in conditioner is that it is absorbed into the hair strands to fill out any damaged areas. These may be caused by a number of things, such as mechanical damage (brushing or combing), thermal damage (using heated styling tools regularly), or environmental damage (such as sun exposure).