Teeth whitening methods include professional in-office whitening, at-home kits provided by dentists, and over-the-counter products. In-office whitening is the fastest and most effective method, providing noticeable results in just one session. At-home kits with dentist-prescribed whitening gels offer gradual, but effective results. Over-the-counter products are more affordable but may not deliver the same level of effectiveness. To determine the best option, visit a dentist near me for personalized recommendations.