The Sonicare 7800 is an electric toothbrush that sports a slim body, bent neck, V-shaped brush head, and sufficiently hard bristles. These dimensions of the brush are so designed to increase its capacity to reach relatively inaccessible areas of the inside of the mouth. This toothbrush uses the patented sonic technology, to provide better plaque removal, whiter teeth, and healthier gums. The Dynamic Fluid Cleaning Action, which combines oscillating and rotating motions, helps clear out sticky plaque even below the gum line. The user has the option to choose between two speeds; high speed for vigorous cleaning and a slightly slower speed for a softer effect on the gums, tongue, and other delicate areas.

The 7800 has a smartimer feature that automatically stops the vibration of the brush after two minutes of use. In addition, there is another user-friendly feature. The Quadpacer interval timer emits a beep every 30 seconds, to intimate the user to change the position of the brush, resulting in a cleaning of all the 32 teeth at the end of the brushing session. The Easy-start power ramp-up feature progressively increases the brushing velocity during the course of brushing to enable the user to adjust to the automated brushing action.

The Deluxe Recharge Gauge enables the user to view the battery charge and, thus, keep abreast of the battery level. The toothbrush is normally shipped with a charger having a power cord, two hygienic travel caps, one compact travel case, one brush head holder, and a small travel case.