Gambex always has to be used with great care and especially careful attention to the directions for its use.This should be in the package insert with the bottle of shampoo. The actual time the shampoo should be left on the scalp is actually only 4 minutes, so the advice you were given is not correct. I do not understand the part about your daughter's nursery school teacher and what she did with the Gambex shampoo so cannot comment about this.
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