Question: how often should i shampoo my thin hair?
Answer: If You Have Fine, Thin, or Oily Hair. Wash every day or every other day, Maryanne Makredes Senna, M.D., a dermatologist at Massachusetts General Hospital, tells SELF. ... 
If You Have Medium-Thick or Dry Hair. Wash every two to three days. ... 
If You Have Thick or Curly Hair. ... 
Pro tip: Your lifestyle matters, too.