Toenails that are cracked are often a sign of extreme dryness which may be caused by too much exposure to water and not enough moisturization or general lack of care. The best thing to apply to cracked toenails is olive oil. Wash your feet in hot water with a herbal soap and apply pure extra virgin olive oil. Wear thick cotton socks to sleep. During the day, it is essential to keep your toenails dry and clean. Avoid prolonged exposure to water. If for some reason, you must have your feet in water for long periods of time, use a heavy oil for moisturizing your skin and nails. Pay special attention to rubbing oil into nails.
Discolored nails may be a sign of fungal infection. You need to get medical help to determine whether this is the problem. You can soak your nails in a solution of warm water and hydrogen peroxide. This will help lighten the color of the nails, alternatively, vinegar can also be used. Do remember to effectively moisturize your skin after you are done with this. Rubbing lime is also an effective way of lightening the color of nails. If nails have turned brown, a soak in diluted bleach may also be required. For fungal infections, it is said that tea tree oil works best. You need to apply it especially in thick layers under your toenails.
answered by G M