A lip and cheek expander for use when performing, dental medicine, dental hygiene or dental-documenting activities comprises two tensioning frames (1, 2) and non-profiled film-like means (3) connecting the tensioning frames (1, 2). In the fitted condition of the expander, inside the oral cavity the inner tensioning frame (1) and on the outside the outer tensioning frame rests against the lips and cheeks. The film-like means (3) are connected at one end to the inner tensioning frame (1) and at the other end to the outer tensioning frame (2). The film-like means (3) oppose forces (5) to the closure and contraction forces of the lips and cheek muscles and dissipates them to the tensioning frames (1, 2). The mouth opening is thereby kept open and the lips and cheeks are kept away from the rows of teeth. A closing of the mouth is also possible when the lip and cheek expander is fitted.
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