Here’s the lowdown on new, longer-lasting treatments: 3 DAYSAvon Advance Techniques Frizz Control Lotus Shield ($12; avon.com) is an at-home silicone-based serum that creates a water-repelling barrier around hair. After regular use for a week, benefits persist—even through shampoos—for up to 3 days. 30 DAYSLiquid Keratin 30 Day Treatment ($30; liquidkeratin.com) is a DIY system that imitates salon treatments to smooth and loosen curls. Heads up: You’ll need to keep hair dry and straight for 48 hours. 12 WEEKSBrazilian Blowout ($250 to $450; brazilianblowout.com) coats strands with amino acids. Tresses become wavy or straight (shinier too!), depending on your hair’s natural curl. Perk to this pro service: There’s no waiting to wash or style hair. 3-5 MONTHSGlobal Keratin Taming System with Juvexin ($250 to $500; globalkeratin.com) comes in three formulas that let your salon customize straightening. Caveat: For supersleek results, low levels of potentially damaging formaldehyde may be required. No washing or styling for 72 hours postservice. More from Prevention: 7 Tips For Shinier Hair
