Negative ions will help make hair shine and healthy. It also refreshes the air by clear hazardous airborne particles.
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What Are Negative Ions And Why Are There So Many Studies on Their 'Health Benefits'? : ScienceAlert
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Why does an electron have a negative ion? - Quora
What are Negative Ions and How do They Improve our Wellbeing?
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What Is Negative Ion / Anion?
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Applying negative ions and an electric field to countermeasure