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Dentist usually works static in extreme posture, like forward bending of the head and neck, forward bending and lateal bending of the body, abduction arm and elevation shoulder. All of those positions could cause muscular fatigue and mechanical pain as neck pain, shoulder pain or low back pain. The most common cause of mechanical pain is postural stress of spine, which leads muscular tension and over stretching ligaments and soft tissues around the joint. To prevent and solve these conditions, the dentist has to correct the body's posture interrupt the static extreme posture by relaxing or stretching of the back and shoulder. This should relief stresses on the discs between the vertebrae, shoulders as well as the surrounding tissues of the joint. Therefore, a dentist sould avoid an extreme static posture and more working ergonoically for a good posture as the key to spinal comfort health.