An adapter for a muscle pressure measuring device to measure the pressure exerted by a body part within a mouth including at least one of an upper or lower lip, a muscle around an oral cavity, a buccinator muscle, and a tongue, comprising:
- a first member having a first connecting portion connected to a main body of a force measuring device, and a first mouthpiece having a an exterior surface and a contacting portion opposite to the first connecting portion, the contacting portion engageable with the body part to be measured;
- and
- a second member having a second connecting portion connected to a main body of a force measuring device, and a second mouthpiece having a an exterior surface and a contacting portion opposite to the second connecting portion, the contacting portion engageable with the body part to be measured,
- wherein, when the first connecting portion is connected to the main body and the second connecting portion is connected to the force measuring portion, the first mouthpiece and the second mouthpiece face each other and can be subjected to pressure by the body part to be measured in a direction closer towards each other.