You should replace your hairbrush every six months to a year.
Women’s Health magazine recommends replacing your hairbrush every six months to a year because, over time, brushes can accumulate build-up from products and matted hair.
“Dirty brushes can make clean hair look dirty, greasy, and weighed down,” Tsippora Shainhouse, MD, a board-certified dermatologist in Beverly Hills, California, told Women’s Health. “The product debris can irritate the scalp, which can lead to redness, itch, and scale.”
Overall, when the bristles begin to separate and cracks appear in the bed of the brush, it’s time to get a new one.