See a dentist to identify the cause
Improve daily brushing with fluoride toothpaste
Floss once daily
Use a fluoride mouth rinse
Reduce acidic and sugary foods and drinks
Drink water after meals and snacks
Use a remineralizing toothpaste with calcium phosphate or hydroxyapatite
Ask a dentist about fluoride varnish or prescription fluoride
Ask about microabrasion for surface white spots
Ask about resin infiltration for early enamel lesions
Ask about teeth whitening if appropriate
Ask about composite bonding or veneers for persistent spots
Treat any underlying enamel hypoplasia, fluorosis, or early decay
Avoid overusing whitening products without dental guidance
Schedule regular dental checkups and cleanings