To manage excess oil on second-day hair, opt for dry shampoo instead—stylists say the powder remnants will mop up excess oil and create more volume. “Just remember to wash it out after using it one to three times in a row, or the buildup can irritate the scalp and dry out fine hairs, causing breakage,” says Tsippora Shainhouse, MD, FAAD, a board-certified dermatologist in Beverly Hills, Calif. Instead, look for products that add moisture and volume. “Applying a lightweight volumizing mousse from roots to ends helps thicken your fine hair without weighing it down,” says Jenna Marie Shafer, a hairstylist in New York City. “Try Amika Plus Size Perfect Body Mousse ($28; sephora.com), which provides massive volume and hydration in a cushiony whipped formula.” RELATED: How to Air-Dry Fine, Thin Hair So It Looks Like a Blowout RELATED: How to Brush Your Hair Based on Your Hair Type If your problem comes down to thinning hair, Dr. Shainhouse recommends looking for ingredients like minoxidil and saw palmetto. “Try Keranique Scalp Stimulating Shampoo ($24; ulta.com), which contains minoxidil, the same ingredient in Rogaine,” she says. “Interestingly, certain dandruff shampoos can also help manage hormone-associated hair loss. Add one into your routine twice a week, and lather it in for two minutes before rinsing.” RELATED: Why Is Everyone Losing So Much Hair Right Now? Here’s What Experts Have to Say