Used for sleeping and resting every day. There are 2 different effects. The high head is only used to adjust the cervical spine for 15 minutes at a time, several times a day to help reduce pain in the neck, shoulders, arms, hands and fingers. The low head is used for sleeping throughout the night, helping to keep the cervical spine in a standard curve, keeping the cervical spine in the correct position, and not being misaligned when lying down. Prevent cervical spine disease due to wrong lying and working posture.
