If gums whiten or sting, get rid of gel, rinse

https://codydjku752.trexgame.net/in-office-vs-at-home-teeth-whitening-your-guide-to-professional-teeth-whitening-gilbert-and-affordable-teeth-whitening-gilbert-az

If gums whiten or sting, get rid of gel, rinse, and use vitamin E oil; decrease gel volume next time and guarantee trays aren't impinging on soft tissues.