Whitening System is more efficient because of the mouth trays that makes the bleaching process more efficient.
The Teeth Whitening Pen is great to carry with you on a trip or to work. It has the same gentle formula as the Whitening System and is perfect for spot treatments.
For maximum effect, we recommend that you treat both with mouth trays and the pen. Whitening System can be performed in the evening and Teeth Whitening Pen in the morning and/or during the day.
The pen's content is sufficient for about 20 treatments.