Can you leave a hair mask on too long?
Stylists explain what happens when you give your hair too much of a good thing.
At times, I even sleep with my hair masks, even if theyre not branded as overnight masks.

However, it recently came to my attention that theres a reason for instruction labels (shocker!
What happens if you keep a hair mask in for too long?
You also can have an allergic reaction.

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Celebrity hairstylistAndrew Fitzsimonsechoes these sentiments.
This creates an imbalance between protein and moisture in your locks, which can weaken and damage your strands.
Keeping these formulas on for too long can result in a darker hair color than initially desired.

With that being said, semi-permanent glosses do not penetrate the scalp, meaning they are still perfectly safe.
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