Hairstylist Nicolas Jequier is cautious, and pointed out in a recent TikTok video that overusing intensive bond-repair products, like Olaplex, may cause hair issues, specifically heaviness and potentially breakage from protein buildup. He advises using Olaplex products strictly as treatments, using every so often as opposed to every day. “I always recommend that my clients alternate products,” Jequier says. “Use products that are not rich in proteins for a few washes and then use a treatment.” Only Olaplex No. 4 and No. 6 contain hydrolyzed vegetable protein at low concentrations, 0.0025% and 0.000625%, respectively.