If such a situation you provide advance purchase repair kit nail. In it you will find special fabric, disinfector, buff, nail file and nail glue. With nail file nail strip, treat it disinfectant. Cut a piece of fabric, place it on the crack. Spread glue, wait until it dries. Now strip the surface of the fabric and nail polish.
Unfortunately, such an operation would be very noticeable. And five days later the nail can still break. There is another way out: Keep a set of false nails. If you usually have long claws, and one suddenly broke down in his place, you can paste the note. Then do not have much to shave all the nails. Invoice nail have to wear until your own is not otrastet. Or for some time yet come to terms with different length nails.
If the nail is just the beginning of bends sharply try to file it in gently. You trade-off fracture and destruction will go slower. If the edge has a rather large crack, it is better to cut the maximum length of the nail. Otherwise it will break itself, and literally "the root" and manicure will look even worse. In addition, it can be very painful.
Of course, you always help in the beauty salon. Ask the service technician to correct the situation. You will have a kind of "patch" for the acrylic nail. Nail after such repairs safely otrastet and your nail polish will always look flawless.
And to avoid such situations, make sure your fingernails. After all, healthy nails are broken extremely rare. Strengthen their help massage wells, wax polish, salt baths.