Here's some tips to solve this problems:
Yellowing
Heat can bake polish into your nails, leaving behind a sallow tint. To prevent, prep nails with two layers of a base coat and choose light, sheer polish colors.
Brittleness
Chlorine and air-conditioning can weaken nail surfaces. Protect them by applying a formaldehyde-free strengthener once a week.
Ragged Cuticles
A dip in the pool or ocean can be drying. Before you go swimming, dab on a moisture-rich balm on your cuticles.
