Keep in mind that if you wait longer than 3 weeks with the refills of the artificial nails, this is very harmful to your natural nails. Owing to overweight of the artificial product on your nail ends, onycholysis can occur. This is the release of the natural nail plate from the nail bed or deformation of the natural smylline, which is certainly not pleasant. If you wait longer than three weeks before the update, I switch over to a completely new set for the health and care of your nails.