Nails are made of a keratin, protein, so make sure your diet includes an adequate amount of protein. Who go on crash diets or make sudden dietary changes often notice that their nails get thinner and brittle. Because nails are not made of calcium, taking calcium supplements and drinking gelatin will not make them grow faster. On the other hand, some research suggests that taking a daily supplement of biotin may help strengthen brittle nails.

If you want to prevent splitting in the first place then try to be gentle on your nails. Avoid using your nails to open pop the tops of soda cans or  packages . If you do see a split or crack in a nail, resist the urge to peel the nail off; instead, immediately file the ragged edges with a nail file or emery board and buff the surface smooth with a nail buffer. This will prevent the split from getting longer and weakening the nail. Filing your nails into a soft rounded shape will also help make them stronger and less likely to split.

Frequent hand washing can dehydrate the nails and predispose them to splitting, be sure to moisturize your nails after they've been in water. To further protect your nails, wear gloves when you're doing the dishes, gardening, or working with any chemicals or solvents. You can use hand cream or cuticle oil.

If you wear nail polish, avoid acetone-containing polish removers, which can dry out the nail. Instead, look for "acetone free" products.

Many person have also had success with topical nail products containing acetyl mandelic acid. While these products won't make nails grow faster, this alpha hydroxy acid helps smooth out splits on the nail surface, so nails have a chance to grow longer before they break off.

If you want better advice, I think you should see a doctor or nail salons, there were professional care team for you, you just sit on a pedicure chair and left pedicue staff will nail salon help you check and nail care