But lately, a new beer-fueled topic has taken over—at least for those of us still holding onto our hair (shout out thickening shampoos and other hair loss treatments ). But the ramifications are much more dire when it comes to washing hair than who’s buying the next round. There is no one-size-fits-all solution when it comes to hair washing. For these hair types, washing once a week or even less may be healthier, especially if the hair is kept longer, Dr. Toy says. More of Our Favorite Hair ProductsBest Shampoos for Men |Best Hair Growth Devices | Shampoos for Thinning Hair | Laser Hair Growth Devices | Hair Thickening Shampoos | Best All-Natural Shampoos | Hair Growth Serums | Shampoos for Hair Growth | Scalp Treatments | Shampoo Bars | Rosemary Oil for Hair Growth | Hair Conditioners | Hair Growth Serums | Hair Clays | Hair Products | Shampoos for Chlorine Removal | Beard Shampoos