Think about a whitening schedule: preliminary everyday sessions till preferred shade

https://andersonwmsf170.yousher.com/in-office-vs-at-home-teeth-whitening-your-guide-to-expert-teeth-whitening-gilbert-and-affordable-teeth-whitening-gilbert-az-2

Consider a whitening schedule: preliminary everyday sessions until preferred shade, then weekly or month-to-month touch-ups to keep brightness without over-bleaching.