Proper oral hygiene is required to maintain oral health and prevent oral disease. Toothbrushing is central to proper oral hygiene. Mechanical tooth cleaning is the mainstay of plaque control. A variety of toothbrushing techniques have been developed and evaluated for their efficacy. However, these evaluations are subjective. To adequately evaluate toothbrushing objectively, a novel toothbrushing monitoring system was developed. The system involves user-monitored brushing patterns including toothbrush motions using a 3-axis gyroscope, 3-axis accelerometer, 3-axis magnetic sensor, one load-cell and Bluetooth devices. To confirm the efficacy of this toothbrushing monitoring system, eight periodontist performed tooth brushing in a dental model, and their brushing motion was monitored and recorded, and evaluated by statistical means. The proposed monitoring system can be used to aid dental care personnel in toothbrushing instruction.