Question: what happens if you don't wash your hair for a month?
Answer: Prolonged periods of not washing can cause cause buildup on the scalp, damaging hair and even impeding its ability to grow, Lamb said. ... Those with coarse or curly hair can buy a bit more time, she said, as many as 10 days. If itchy dandruff or a scaly scalp occurs, it may feel tempting to scratch.