Reduce level of sensitivity during whitening with desensitizing gels or toothpaste including potassium nitrate or fluoride

https://telegra.ph/The-Reality-About-Charcoal-Tooth-Paste-Does-It-Truly-Whiten-04-16

Lower level of sensitivity during whitening with desensitizing gels or toothpaste including potassium nitrate or fluoride, and follow day of rest in between sessions if required.