The cervical pessary is a silicone device that has been used to prevent SPTB. The efficacy of cervical pessary has been assessed in several populations including singletons with short CL, unselected twins, twins with a short CL, and triplet pregnancies. Several randomized clinical trials (RCTs) have been published, and several are ongoing. However, no consensus on the use of cervical pessary in pregnancy or guidelines for management have been assessed.