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Quality does make a difference in the overall look and longevity of your nails to a certain extent, but don't feel the need to splurge. You can pick out an inexpensive set, especially if you're experimenting with different looks. Choose a set that covers the whole fingernail, not just the tips. A cheap set of nails that's well cared for will last longer than a more expensive set if you don't maintain it properly. The fake nails in press-on sets come in multiple widths from 9 to 18 mm (0.35 to 0.71 in). Measure your natural nails to see if yours are on the narrower or wider sides of the spectrum, or somewhere in the middle. Try to find fake nails that mimic the curve of your fingernails, whether they're mostly flat or have a pronounced arch.   Place a tape measure or ruler across the widest part of your nail to gauge the width. The nail size is often printed on the back of the nail. Once you find the right sizes for each fingernail, write them down or make a note in your phone for future reference! Fake nails come in a variety of lengths, from extra-short and short to medium, long, and extra-long. The sizes aren't generally identified by a numerical length, but the shortest possible set will last longest. Choose press-ons that barely extend past the pad of your fingertip.  Shorter press-ons can be just as stylish as long, pointy talons. They'll be more durable and practical for everyday wear. You're less likely to risk having a short fake nail pop off when you do your laundry, for instance. But it's easy to get a long nail caught on something, especially if you're not used to having long nails. Fake nails come in a variety of shapes, from square and oval (or “squoval”) to more fanciful shapes like almond, stiletto, and coffin. Pick tips that closely relate to natural nail shapes, such as rounded or square tips, to extend the lifespan of your fake nails.  Square-tipped nails can be easily re-shaped and rounded out, whereas oval nails can't be reshaped or squared off as easily.  Steer clear of pointed nail shapes like stiletto, coffin, and almond press-ons. The sharp tips can more easily catch on things and you'll risk dislodging a nail. Pointed nail tips also require more length, but this will shorten the lifespan of your press-ons. While adhesive strips can be useful for keeping fake nails on for a short period of time, a professional grade liquid nail glue will help keep your press-ons in place for weeks. Look at the packaging to make sure the glue is compatible with the type of nails you've selected, and consider the pros and cons of different drying times.  If you're new to the process of applying fake nails, select a glue with a slower setting time so that you can make last-minute adjustments.  If you're skilled at applying fake nails, consider a quick-dry formula.
Select a set of full-coverage press-on nails. Pick fake nails that match the width and curve of your natural nails. Pick short or extra-short fake nails instead of long nails. Choose a set of nails with rounded or square tips. Use strong-hold, long-lasting nail glue instead of adhesive stickers.