According to Emergency Dentistry Services in NYC, Teeth whitening is a non-invasive cosmetic procedure that lightens teeth and removes stains. It can be performed in-office for immediate results or at home using custom-fitted trays provided by your dentist. Professional whitening treatments use safe but powerful bleaching agents to break down stains caused by food, beverages, or smoking. The result is a brighter, more youthful smile that can boost self-esteem and make a positive first impression.