Abstract: The device for verifying parallelism of abutment teeth for dental appliance insertion provides a visual indicator for a dental practitioner for determining parallelism in a pair of abutment teeth. The device for verifying parallelism of abutment teeth for dental appliance insertion includes a housing having a top end, a bottom end, and longitudinally-extending slot formed therethrough. First and second rods are received within the longitudinally-extending slot and are longitudinally slidable therein, with each of the first and second rods extending laterally (i.e., perpendicular to the longitudinal direction) through the longitudinally-extending slot. First and second plates are respectively suspended from central portions of the first and second rods and are longitudinally slidable through an opening formed through the bottom end of the housing. First and second ratcheting mechanisms respectively limit rotational movement and rotational direction of the first and second plates with respect to the housing.