Dental teeth whitening is a cosmetic dental procedure that lightens and brightens discoloured teeth caused by aging, food and drink stains, smoking, and other factors.  The procedure can be done at a dentist’s office or at home using custom-made trays and whitening gel provided by the dentist. In-office treatments typically take about an hour, while home treatments may take several weeks to achieve optimal results. Teeth whitening is generally safe when performed by a qualified dentist or dental professional. However, it may cause sensitivity or gum irritation in some people. It’s important to follow the dentist’s instructions carefully and avoid overusing or misusing the whitening products.