Yes. Over the longer term, they are both effective at whitening your teeth, but they are designed for different purposes. The Whitening Kit delivers whitening gel in a tray that keeps the gel in contact with your teeth for a longer period during each applications, allowing you to achieve noticeable results more quickly. The Whitening Pen applies a smaller amount of gel directly to the teeth, making it ideal for gradual whitening and maintaining your results between whitening kit cycles.