Long‐Term Whitening Stability in Combined In‐Office and At‐Home Whitening Protocols: A Randomized Controlled Clinical Trial

OBJECTIVE: This clinical study assessed the color stability of combined whitening protocols for up to 2 years when using prefilled at-home whitening trays during intervals between in-office whitening sessions. MATERIALS AND METHODS: . RESULTS: (p < 0.05) in the early follow-up periods when compared with that of group I. CONCLUSIONS: The use of both in-office whitening and at-home whitening using prefilled trays resulted in longer-lasting whitening efficacy than in-office whitening alone.