If you are using professional salon quality shampoos, you may never need to switch shampoos. Water conditions may affect how some products react with your hair and may cause you to change shampoos regularly. If you travel, it may be wise to have various shampoos that will work with different water conditions. Also certain oral medications can exit through your hair. If you have recently switched medications, you may also want to change your current shampoos, conditioners and styling products. If you are using a shampoo or conditioner that works fine for the first couple of days and then begins to weigh hair down, you are using poor quality products.
For How Often to Change Your Shampoo we recommend these products:
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