The most important rule: do not rip press-on nails off. Most press-on damage happens during removal, not application.
If a nail is firmly attached, forcing it off can peel layers from the natural nail plate. That leaves nails thin, sore and rough.
A gentler removal routine
Start with warm soapy water and a little cuticle oil. Soak for several minutes, then gently test the edge with a wooden stick. If it does not move, keep soaking. Patience matters.
For glue-on sets, some people use acetone, but acetone can be drying. If you use it, protect surrounding skin with oil and moisturize afterward. Follow the product instructions because glues and press-on materials vary.
What not to do
Do not pry under the nail aggressively.
Do not use metal tools with force.
Do not reapply a new glued set immediately if your nails feel sore.
Do not buff the nail plate thinner to make damage look smooth.
Aftercare
Moisturize nails and cuticles. Keep nails short while they recover. Mayo Clinic recommends keeping fingernails dry and clean, using moisturizer, and avoiding harsh nail-care habits.
Can thin nails become thick again?
Damaged nail plate has to grow out. You cannot instantly make a thin nail thick overnight. Better habits help the new nail grow in stronger, but visible improvement takes time.
For brands
If you sell press-ons, include removal instructions. It is not just customer service; it protects reviews. A beautiful set can still get blamed if customers do not know how to remove it.