Fluoride varnish or remineralizing pastes can be applied after whitening to reinforce enamel

https://telegra.ph/Whitening-for-Delicate-Teeth-How-We-Minimize-Discomfort-04-15

Fluoride varnish or remineralizing pastes can be applied after whitening to strengthen enamel and reduce level of sensitivity while preserving your brighter smile.