Your hair gets used to one shampoo so you should change it regularly.
As long as it's a good shampoo suited to your scalp and hair type, you should get fine results every time.
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Dandruff is caused by dry scalp.
Baldness comes from mother's side of the family.
Shaving will make my beard grow thicker or faster.
Sunscreen sprays for hair is good.
Frequent trims make hair grow faster.