Keep nails short and file them gently in one direction
Use a fine-grit nail file instead of metal files
Avoid using nails as tools
Wear gloves for washing dishes, cleaning, and gardening
Moisturize nails and cuticles daily with hand cream, cuticle oil, or petroleum jelly
Apply a strengthening base coat or nail hardener
Limit exposure to water, detergents, acetone, and harsh chemicals
Remove nail polish gently and less often
Avoid gel, acrylic, and frequent manicures if nails are weak
Eat a balanced diet with enough protein, iron, zinc, and biotin
Drink enough water
Treat underlying issues such as eczema, psoriasis, anemia, or thyroid problems
See a dermatologist if splitting is persistent, painful, or severe