Abstract: A lever device includes first and second levers coupled at a lever pivot. First end of a first bar is pivotally coupled to the first lever at a first lever-bar pivot. First end of a second bar is pivotally coupled to the second lever at a second lever-bar pivot. First tool is pivotally coupled to a distal end of the first lever at a first lever-tool pivot. Second end of the first tool is pivotally coupled to the second end of the second bar. Second tool is pivotally coupled to the second lever at a second lever-tool pivot and a second end of the lever is pivotally coupled to the second end of the second bar. First lever-bar pivot is between the lever pivot and a distal end of the first lever and the second lever-bar pivot is between the lever pivot and a distal end of the second lever.

Abstract: A tissue stretching device includes a first and second mouthpiece. Each mouthpiece includes a bite area, an extension bar, and an interface area. The bite area is shaped to match the general curvature of a set of teeth. The interface area has a raised body. The extension bar is positioned between the bite area and the interface area. A connecting assembly is linked to the interface area of the first mouthpiece and the second mouthpiece and arranged to couple the first mouthpiece inline with the second mouthpiece. The second mouthpiece is positioned in an inverted position relative to the first mouthpiece to place the raised body of the first and second mouthpieces in opposing directions. The connecting assembly includes an elongate member. At least one of the first and second mouthpieces is able to be positioned along the elongate member relative to the other mouthpiece.