A jaw exerciser is provided. The jaw exerciser includes an elongated first portion having a first cross-sectional area, wherein the elongated first portion is configured to be inserted into the mouth, and includes an outer surface adapted to be engaged and clenched by the teeth. The jaw exerciser also includes an elongated second portion having a second cross-sectional area and an outer surface, wherein the elongated second portion is configured to remain outside the mouth when the first portion is inserted into the mouth. Furthermore, the jaw exerciser includes an intermediate portion having a third cross-sectional area. The intermediate portion joins the elongated first and second portions, and is configured to be grasped and encircled by the lips to thereby retain saliva inside the mouth.