The best answer to this question is: it depends. Some people smoke. Some people drink coffee, tea, or red wine every day. Some people drink only an occasional coffee drink. These foods, beverages, and habits will stain your teeth. A good rule of thumb is that if it will stain a white shirt, it will stain your teeth. So, if you never do things that stain your teeth, then your whitening results will last a long time. If you do, the results will more quickly fade over time. The bright side (pun intended!) is that after the teeth whitening procedure, you can touch-up occasionally to restore your bright smile. One night every 2 months will usually do or alternatively one week every year. You can always purchase more whitening gel from us and use your retained custom fit trays