The main objectives of this project are: 1) To determine the effectiveness of a manual therapy protocol plus the use of a dynamic jaw opening device (DTS) on the maximal interincisor distance (MID) in subjects with trismus. Hypothesis: Individuals with trismus receiving a manual therapy protocol plus the use of a DTS, for six months, will have a significant increase on the maximal interincisor distance (MID) (measured with a slide caliper) after treatment.