An oral care system at least comprises an oral care tool, a terminal equipment and a sensing device installed on said oral care tool; wherein said sensing device is configured to detect real-time dynamic data of said oral care tool to obtain real-time absolute positions of said oral care tool and transmit them to said terminal equipment, or otherwise to directly detect real-time dynamic data of said oral care tool and transmit them to said terminal equipment, which obtains real-time positions of said oral care tool; said terminal equipment is configured to update virtual images in real time according to real-time positions of said oral care tool during the oral care process; at least the images used to represent said oral care tool, the images used to represent the teeth and the positions between them are made to be updated and displayed in real time according to these real-time positions; wherein said sensing device at least comprises a first detection module and a second detection module; wherein said second detection module is configured to distinguish whether upper teeth or lower teeth are cared, characterized in that said first detection module is configured to obtain the absolute position of said oral care tool; said first detection module is configured to detect yaw angles of said oral care tool and then calculate the absolute position of said oral care tool in real time according to the differences in yaw angles between real-time positions and initial reference positions and the radian information of gums; the sensing device used by said first detection module comprises a gyroscope and magnetometer, which are installed on said oral care tool to obtain yaw angles of said oral care tool by said gyroscope and magnetometer. said sensing device is configured to detect real-time dynamic data of said oral care tool to obtain real-time absolute positions of said oral care tool and transmit them to said terminal equipment, or otherwise to directly detect real-time dynamic data of said oral care tool and transmit them to said terminal equipment, which obtains real-time positions of said oral care tool; said terminal equipment is configured to update virtual images in real time according to real-time positions of said oral care tool during the oral care process; at least the images used to represent said oral care tool, the images used to represent the teeth and the positions between them are made to be updated and displayed in real time according to these real-time positions; wherein said sensing device at least comprises a first detection module and a second detection module; wherein said second detection module is configured to distinguish whether upper teeth or lower teeth are cared, characterized in that said first detection module is configured to obtain the absolute position of said oral care tool; said first detection module is configured to detect yaw angles of said oral care tool and then calculate the absolute position of said oral care tool in real time according to the differences in yaw angles between real-time positions and initial reference positions and the radian information of gums; the sensing device used by said first detection module comprises a gyroscope and magnetometer, which are installed on said oral care tool to obtain yaw angles of said oral care tool by said gyroscope and magnetometer.