Formaldehyde is a hot debate topic among nail professionals and dermatologists. While some eschew the preservative in favor of natural product ingredients, others laud it for its nail-strengthening properties. But along with harder nails comes a risk of allergic reaction, and long-term use can cause nails to split and become brittle.
Our advice? With so many formaldehyde-free nail polishes and products on the market, err on the side of caution and look for alternative nail strengtheners.
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