The traditional French nail is painted with white nail polish, and a circular arc like a smile on the front of the nail. The unique term "smile line" in the manicure is born.
Nowadays, there are many kinds of color changes, and the definition of French style is gradually expanded. Any use of two colors, and there is a clear border, can be called French nails. Before the white part is no longer a single color, as long as you can think of can be applied.
Experts recommend that you just try to do it yourself, and you can use the shining nail polish to cover the fingertips. The boundaries of the smile line can not be so obvious. After the proficiency test, you will try to have a clear demarcation line.