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What is the difference between lye and no-lye relaxers?

The difference is in the type of chemicals used. In lye relaxers, the active ingredient is sodium hydroxide. In no-lye relaxers, the active ingredient is calcium hydroxide. No-lye relaxer is usually a little milder and good for sensitive scalps, but the calcium can cause hair to be slightly drier. Most relaxer kits made for home use are no-lye formulas.
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