The general recommendation for how often to dye hair is about every 4 to 8 weeks, with 4 to 6 weeks being a commonly suggested interval for most hair coloring to touch up roots or overall dye jobs. This timing allows hair to recover and minimizes damage. Semi-permanent dyes can be applied more frequently, while permanent dyes and bleaching require longer intervals to maintain hair health. It's important to consider the condition of the hair, with damaged or brittle hair needing more time or avoiding frequent dyeing altogether. Root touch-ups alone can sometimes be done every 10 to 14 days to keep color fresh without altering the whole hair length. Hair care, such as using conditioning treatments, is essential between dyeing sessions to maintain hair health.