Why it's worth it: You know OPI for their stunning array of lacquer hues, but they also know how to knuckle down for a dose of tough love. The Nail Envy Nail Strengthener Treatment imparts ...
After a few weeks of using this nail strengthener, I noticed my nails were ... “Apply a treatment base coat. I’d recommend OPI’s Repair Mode, £29.90, a bond-building base designed to ...