While we were intrigued by the premise of using artificial intelligence to more efficiently brush your teeth, we discovered that, on the whole, the Colgate E1 failed to impress us. This product only performed slightly above average in our cleaning metric, paling in comparison to the rotation-oscillation toothbrushes that we have tested. It also didn't strike us as being particularly easy to use or exceptionally comfortable, though it did have an impressive battery life. The main thing that sets this brush apart is its companion app, which we didn't find to be enough to offset its overall lackluster showing.
While the Colgate did do very well in our battery life tests, we have noticed that this model seems to have an unusually high standby power consumption, finding it dead after a week with only intermittent use. We are going to continue to look into this and update the review accordingly.