Whether you cool off in a pool or the ocean, trichologist (scalp doctor) Elizabeth Cunnane Phillips has advice on how to keep your hair healthy while you dip. Before you dive in: Saturate hair with fresh water so it can’t absorb as much salt or chlorine. During your swim: Keep hair tied in a braid or bun to minimize the surface area exposed to water. After you exit: Gently comb out tangles and, if you can, rinse again with fresh water. MORE: 12 Highly-Effective Treatments For Thinning Hair