A mouth mirror apparatus comprising: a mounting frame defining a central axis, and including a major wall with a periphery, a surrounding wall which has an upper wall segment which extends upwardly from said periphery to surround the central axis and to terminate at an upper end, and which defines an upper space together with said major wall, said upper wall segment having a suction port configured to draw out fluid in said upper space, and a lower wall segment which extends downwardly from said periphery to surround the central axis and to terminate at a lower end, and which defines a lower space together with said major wall, and a bottom cover wall secured to said lower end of said lower wall segment to enclose said lower space; an elongated handle defining therein a passage; a mirror member rotatably mounted on said major wall, and including a mirror body which is disposed in said upper space and which has a raflecting surface facing upwardly, and a rotatable shaft which extends downwardly from sad mirror body through said major wall into said lower space so as to be driven to rotate about a shaft axis; and a driving member coupled to said rotatable shaft so as to drive said rotatable shaft to rotate about the shaft axis, wherein said elongated handle has a fluid outlet port downstream of said passage, and is connected to said surrounding wall such that said pas sage is disposed downstream of said suction port; said driving member is rotatably disposed in said lower space and is mounted on said rotatable shaft so as to permit said rotatable shaft to rotate therewith, said driving member including a plurality of blades which are angularly displaced from one another about the shaft axis; said lower wall segment has an internal port communicating said passage with said lower space; and said mounting frame is formed with at least one fluid intake port (112, 112') configured to draw out excess saliva or water during dental procedures, said fluid intake port is disposed upstream of said internal port such that a fluid stream is permitted to be drawn into said lower space through said fluid intake port (112, 112') to flow toward said internal port so as to force said blades to rotate about the shaft axis to thereby rotate said mirror member. a mounting frame defining a central axis, and including a major wall with a periphery, a surrounding wall which has an upper wall segment which extends upwardly from said periphery to surround the central axis and to terminate at an upper end, and which defines an upper space together with said major wall, said upper wall segment having a suction port configured to draw out fluid in said upper space, and a lower wall segment which extends downwardly from said periphery to surround the central axis and to terminate at a lower end, and which defines a lower space together with said major wall, and a bottom cover wall secured to said lower end of said lower wall segment to enclose said lower space; a major wall with a periphery, a surrounding wall which has an upper wall segment which extends upwardly from said periphery to surround the central axis and to terminate at an upper end, and which defines an upper space together with said major wall, said upper wall segment having a suction port configured to draw out fluid in said upper space, and a lower wall segment which extends downwardly from said periphery to surround the central axis and to terminate at a lower end, and which defines a lower space together with said major wall, and an upper wall segment which extends upwardly from said periphery to surround the central axis and to terminate at an upper end, and which defines an upper space together with said major wall, said upper wall segment having a suction port configured to draw out fluid in said upper space, and a lower wall segment which extends downwardly from said periphery to surround the central axis and to terminate at a lower end, and which defines a lower space together with said major wall, and a bottom cover wall secured to said lower end of said lower wall segment to enclose said lower space; an elongated handle defining therein a passage; a mirror member rotatably mounted on said major wall, and including a mirror body which is disposed in said upper space and which has a raflecting surface facing upwardly, and a rotatable shaft which extends downwardly from sad mirror body through said major wall into said lower space so as to be driven to rotate about a shaft axis; and a driving member coupled to said rotatable shaft so as to drive said rotatable shaft to rotate about the shaft axis, wherein said elongated handle has a fluid outlet port downstream of said passage, and is connected to said surrounding wall such that said pas sage is disposed downstream of said suction port; said driving member is rotatably disposed in said lower space and is mounted on said rotatable shaft so as to permit said rotatable shaft to rotate therewith, said driving member including a plurality of blades which are angularly displaced from one another about the shaft axis; said lower wall segment has an internal port communicating said passage with said lower space; and said mounting frame is formed with at least one fluid intake port (112, 112') configured to draw out excess saliva or water during dental procedures, said fluid intake port is disposed upstream of said internal port such that a fluid stream is permitted to be drawn into said lower space through said fluid intake port (112, 112') to flow toward said internal port so as to force said blades to rotate about the shaft axis to thereby rotate said mirror member.