Teeth whitening is usually safe when monitored; overuse or high concentrations without assistance can aggravate gums

https://kylerbqsz130.bearsfanteamshop.com/reasons-to-pick-professional-whitening-over-store-bought-kits

Teeth whitening is typically safe when monitored; overuse or high concentrations without assistance can aggravate gums and increase level of sensitivity-- follow instructions carefully.