Delicate teeth? Start with low-peroxide gels, shorten sessions
https://kylerbqsz130.bearsfanteamshop.com/the-ultimate-guide-to-specialist-teeth-whitening-what-to-anticipate
Sensitive teeth? Start with low-peroxide gels, reduce sessions, and pre-treat with desensitizing toothpaste for 2 weeks before starting whitening.