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Episode 339 - How Long Does Sunscreen Really Last and Why Does it Degrade?

The Beauty Brains

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Introduction

The Beauty Brains is a show where real cosmetic chemists answer your beauty product questions. Can you use benzoyl peroxide on your underarms? What's the deal with sunscreens? Do they really just stop working? And finally is it okay to use dog conditioner on your own human hair?

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