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Use moleskin pads. Try using white-out.
You know the little round moleskin pads you might use for blisters on your feet? Well, they happen to work perfectly for getting rounded white tips without wiggly edges. When you've finished your nail color (the light pink or tan, whichever you prefer), and the color has dried, put a moleskin pad at the top of the nail, so that only a small portion of the tip is exposed. Paint your white polish over the top of this, and when the paint is dry, peel the pads off. Your white tips should be perfectly rounded, and any mistakes you made will peel off with the moleskin. It may sound strange, but if you're having difficulty painting with a white nail polish, white-out (for pen mistakes) might be the perfect solution. Because the application sponge for white-out is square, it makes it easy to dab the white color in a perfect line across your nail tip. Just use white-out instead of white nail polish, and finish it off with a top coat. Nobody will know the difference, and you'll have saved yourself loads of time!, and there you go,you are ready to show off your beautiful french manicure.