Erre Due Nail Hardener is an excellent base specially designed to provide strong and shiny nails without the unwanted yellowing. Its composition contains the active ingredient aldehyde, which contributes to the strengthening of keratin and helps the natural growth and strengthening of nails. It is enriched with ingredients that do not contain formaldehyde and toluene, thus offering a safe application without harmful substances. It is extremely easy to use. Apply a coat of Nail Hardener before your favorite polish to provide extra protection and strength to your nails. You can also use it alone, applying two layers, for a natural manicure that provides shine and care to your nails. Enjoy the strengthening and care offered by this product, highlighting the natural beauty of your nails with a reliable and neat result.