https://www.reddit.com/r/askdentists/comments/10z0uf0/zingers_after_tooth_whitening_how_long_will_these/
Zingers after tooth whitening, how long will these last? : r/askdentists
Feb 10, 2023 ... Mine lasted about 5-6 hours, becoming less frequent over that period. I was so scared that they'd never go away, but they did!