Think about cost-benefit: in-office treatments are quicker however more expensive; take-home trays are cost-effective with gradual

https://blogfreely.net/dernesvhbz/the-length-of-time-does-teeth-whitening-last-a-realistic-timeline-snzf

Consider cost-benefit: in-office treatments are much faster however more expensive; take-home trays are economical with gradual results-- choose based upon timeline and budget.