After reviewing several sources, here are some of the best long-lasting non-toxic nail polish brands, along with their positive and negative aspects:
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Butter London: This brand claims to have ingredients that promote healthier, stronger, and brighter nails. It has been reported to last up to ten days with no signs of chipping and lots of shine. However, it has a higher price point.
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Zoya: This brand is marketed as having long-lasting wear and is 10-free (free of 10 of the most harmful leading polish ingredients). It has been reported to last up to six days. However, it is tough to find exact details on what "non-toxic" means for this brand.
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Acquarella: This brand has nearly zero scent and is long-lasting. It has been reported to last up to three days with zero chips. However, it is not great for kids and has a strong smell.
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Ella + Mila: This brand is marketed as being 7-free and has been reported to last up to six days. However, it is difficult to apply and damages nails upon removal.
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Piggy Paint: This brand is marketed as being water-based and non-toxic. It has been reported to last up to three days. However, it may not be as long-lasting as other brands.
It is important to note that some non-toxic nail polish brands may still contain ingredients that are not completely safe. It is recommended to check the ingredients list and do research on the brand before purchasing.