Yellow or dull nails are often caused by dark nail polish, smoking, or cleaning products. A simple home remedy for mild stains is a paste made from lemon juice and baking soda. Lemon helps brighten stains, while baking soda gently exfoliates the nail surface.
Apply the paste to clean nails for a few minutes, rinse with lukewarm water, and moisturize afterward. Avoid harsh scrubbing, as it can weaken nails. Using this treatment once a week, along with moisturizing, wearing gloves for cleaning, using a base coat, and staying hydrated, can help keep nails healthier and brighter over time.
However, persistent yellowing, thick nails, pain, or crumbling may signal an infection or other health issue and should be checked by a doctor or dermatologist.