Trim toenails straight across and keep them short
Wash feet daily and dry them thoroughly, especially between toes
Change socks daily or more often if feet sweat
Wear breathable shoes and rotate pairs to let them dry
Use antifungal foot powder or spray if sweating is a problem
Avoid tight shoes that press on toenails
Stop using nail polish and artificial nails until the color improves
Disinfect nail tools after each use and do not share them
Treat athlete’s foot promptly if present
Use an over-the-counter antifungal nail treatment if the cause is likely fungal
See a doctor for prescription antifungal treatment if the yellowing persists
Seek medical care if the nail is thick, crumbly, painful, lifting, or has dark streaks
Seek medical care if you have diabetes, poor circulation, or a weakened immune system
Avoid smoking to support healthy circulation
Maintain good foot hygiene and keep footwear clean and dry