I. Definition: Onychoschizia or splitting of the fingernails is one of the most common problems that the dermatologist sees. The term onychoschizia includes splitting, frail, soft or thin nails and nails with ridges. Onychoschizia is more common in women. II. Causes: Repetitive and prolonged wetting and drying of the fingernails is the single most common cause of splitting and ridging of the nails. Splitting of the nails is rarely caused by internal disease or vitamin deficiency. Nail polish remover causes onychoschizia. Trauma to the fingers contributes to onychoschizia. III. Treatment: The best treatment is to avoid repeated wetting and drying of the nails. Try to wear cotton lined rubber gloves when performing household chores that involve getting the hands wet. Rub lotions containing alpha-hydroxy acids such as Neostrata or lanolin containing lotions such as Elon into the nails both before and after getting the hands wet. Watch people who have beautiful nails. Notice how they use their hands or finger pads to do simple chores rather than use their nails. Never dial a phone with the nail tips; use a pencil. Nails should never be used as tools. Get in the habit of using your fingers as if they have wet polish on them. If you can’t avoid trauma to the nail tips, keep the nails cut short Always wear gloves during cold weather and when you do chores which may traumatize the nail tips. Never peel or scrape off nail polish. Shape and file the nails with a very fine file and round the tips in a gentle curve. Daily filing of snags or irregularities helps to prevent further breakage or splitting. Never use metal instruments on the nail surface to push back the cuticle because this scrapes away the microscopic protective cells of the nail surface. When (and if) the nails are "buffed," do this in the same direction as the nail grows and not in a "back and forth" motion because this can cause nail splitting. Nail polish can protect the nail surface. The almost daily application of a "top coat" will keep the nail tips protected. Nail polishes with nylon fibers in them may add strength and protection to fragile nails. Use nail polish remover as infrequently as possible because it dries out the nails. One study has shown that biotin (a vitamin) 2.5 mg a day taken by mouth is beneficial. Do not do this if you are pregnant. Some patients are convinced that one pack of Knox Gelatin mixed with orange juice and taken by mouth each day will restore nails to a youthful state. There is no scientific data that supports the use of unflavored gelatin to strengthen nails. Taking colloidal minerals and a multivitamin each day has been shown to increase the speed of nail growth which in turn leads to healthier nails.

If this condition is part of your "MO" you already have the answer, other wise, do u bite ur nails?, do u work with paper? use exsesive harsh detergents, do u work at a hospital?, My point is unless is a generic condition pay attention to what it is u do! some cases are related to vitamin deficincies or particular ailments ie: liver, kidney sink, iron deficiencies, drugs or lifestyles. check with your Dr.. Carmen, Flushing NY

Nails split up because the different layers don't stick together...this is usually caused by a lack of cheratin, which is in turn due to a lack on minerals. So you need to eat fruit and veg, and integrate your diet with mineral integrators. Also you should wear gloves with cotton inside everytime you do houseworks or dish washing. Be careful when you tape on the keyboard, and even when you move..hitting your hands against walls, desks and so on will damage your nails, so it's also about attitude. Be very very careful when you chose nail varnish, maybe spend some more quids on it, but go for good and anallergic products (withour nickel and so on, i personally like La roche posay products). Don't wear nail varnish for too long: it is good to look after your nails and mind to protect them (if nail varnish is chipped it means you hurt your nails) but it also tends to suffocate them. Finally, you can improve your nails by massaging every evening every nail with olive olive + lemon juice, which strenghts, cleans and withens you nails, and then use specific products such as revlon nail treatments.