The cost of teeth whitening can vary depending on the method you choose. Over-the-counter whitening products, like whitening toothpaste, gels and strips, are the most affordable option and can be found for as little as $5. Professional in-office teeth whitening performed by a dentist can cost anywhere from $500 to $1,000. At-home teeth whitening kits that use custom-fitted mouth trays and stronger bleaching gel provided by your dentist can also be quite expensive, costing upwards of $500.