This study examined the effects of a posture correcting mat intervention on mouth opening and sagittal spinal alignment in healthy adults. Sixty-three male participants were divided into the spine mat, mat without protrusions, and bed groups. Mouth opening and sagittal spinal alignment were measured before and after intervention. Only the posture correcting mat group showed significant improvements in mouth opening and decreased thoracic kyphosis and lumbar lordosis angles after the intervention. The results suggest that the use of a posture correcting mat may improve thoracic alignment, reduce stress on the temporomandibular joint and masticatory muscles, and lead to increased mouth opening.
