Professional in‑office whitening delivers the fastest, most noticeable results in a single visit, while custom take‑home trays offer gradual whitening with lower sensitivity over 1–2 weeks. For intrinsic or resistant stains, porcelain veneers provide a permanent color change and also correct shape and minor alignment in one procedure. Suitability depends on stain type, enamel thickness, existing restorations, and sensitivity; a shade assessment and exam determine the right option.