Can the security level C cushion be used as a pillow?
It doesn't matter if the pillow chooses the right and safe level. Long term use of unsuitable pillows can cause a series of chronic strains, and even develop into cervical spondylosis.
The shape of the pillow should first conform to the normal physiological curve of the human body, so that when sleeping, regardless of supine, lateral position, cervical spine, respiratory tract restoration, normal physiological curve at ordinary times. Although said is "pillow", in fact, "pillow neck" is correct, should be pillow in the back of the head and shoulder in the middle of the neck, when sleeping soundly to support the role of the neck. In supine, the highest point should be in the middle of the neck, in order to support the neck song, to maintain the physiological curvature of the neck. The lowest point of the pillow is the back of the head; the pillow supports the side of the neck while lying on the side. To keep the front view of the spine in a straight line, from the side view is normal S (physiological curve) principle.
