Teeth whitening can be the simplest procedure to improve a smile and help regain confidence. Whitening can be used to correct tooth discoloration and staining. Staining can be caused by a multitude of things including: aging, coffee, tea, soda, wine, and smoking.  Custom whitening trays are used to precisely whiten teeth and protect the gums around them. Teeth are whitened using a bleaching agent provided by the office. The bleaching agent comes in different concentrations and is chosen based on tooth sensitivity and the degree of whitening desired.