To eliminate dandruff, which is a recurring issue, one should not space out shampoos, but rather adopt a regular washing routine with appropriate active ingredients to maintain a healthy scalp.

noli's read

The recommendation to maintain a regular washing frequency to regulate dandruff is based on sound scientific evidence. A large-scale observational study conducted by Punyani et al. (2021) shows that low washing frequency is directly correlated with an increased presence of dandruff and scalp discomfort. Indeed, spacing out shampoos promotes sebum buildup, which nourishes the small yeasts naturally present on the scalp and triggers irritation. Furthermore, several randomized clinical trials demonstrate that the use of hair care products containing targeted active ingredients (such as piroctone olamine) helps to gently rebalance the scalp microbiome. This chronic and persistent nature is also widely validated by the opinions of hair care and trichology professionals, requiring a regular maintenance routine rather than a one-off solution. The creator's claims are therefore entirely consistent with current knowledge in hair care.

the sources

No named source held this one up — that absence is part of the verdict.