Over the years, there has been consistent consumer demand for whiter, brighter teeth and an attractive smile.  Professionally administered (in-office) tooth whitening, also known as dental bleaching, remains a popular aesthetic procedure and can be performed using a wide range of techniques and application protocols.  Another common approach is at-home whitening with custom-fitted trays, which patients use to apply professional-strength bleaching gel (for use at night or during the day).  Numerous over-the-counter (OTC) whitening products (e.g., strips, gels, rinses, chewing gums, or paint-on films) are also widely available for at-home application.