Why Your Nails Pop Off: The "Flat vs. Curved" Nail Bed Guide

You measured your width perfectly (16mm, check!). You prepped your cuticles. Yet, your press-on nail popped off in two hours, or worse—it felt like it was pinching your finger.
The culprit is likely not the size, but the Arch (C-Curve).
Just like shoes have high arches or flat soles, fingernails have different curvatures. At TsukiNails, our handmade sets are designed with a natural "C-Curve," but if your natural nails are very flat or extremely curved, you need a few custom tricks.

1. The "Eye Level" Test
How do you know your type?

• Step 1: Hold your hand up at eye level and look down the "barrel" (the tip) of your finger.

• Flat Nail Bed: Your nail looks like a flat line or a very gentle hill.

• Curved (High Apex) Nail Bed: Your nail looks like a deep "U" shape or a rainbow arch.

2. Problem A: "My Nails Are Too Flat"
If you put a standard press-on over a flat nail, there is a gap in the middle. Air gets in, and the nail pops off.

• The Hack: Build a Bridge.

  • Use Sticky Tabs: Adhesive tabs are thicker than glue. Layering a tab fills the empty space in the middle.

  • The "Double Glue" Method: Apply a drop of glue to your natural nail AND a drop to the center of the press-on. Let it get tacky for 5 seconds before pressing. This creates a cushion.