Apply adhesive on natural nails directly instead of applying them on false nails will significantly increase the lasting. As we tested, the two methods lead to results while one may drop the next day, the other may be staying more than 7 days. The adhesive adhere to inner surface of false nails fit better than natural nails' since pressed when camber of two nails are not the same. Pls check B07V5GVDZR B07V5GSJ5Q for replacement. The adhesion is satisfying if glue on natural nails first.