Dual forms should be chosen depending on the nail plate, and there is one most convenient nail type for this method of nail extension — flat nails. Why so? 🧐 👉Because dual forms require space for the gel in between the form and the nail. If the nail is flat, you won’t be able to press that hard to squeeze the gel from underneath 😜. Natural protection from leaks 😂. And the arch comes out just so perfect. Another plus is that almost all forms fit flat nails, you don’t have to be too choosy. @n