A brush head device of a multifunctional oral care tool comprises a pair of transmission rods (5) respectively connected with a pair of brush heads (1). The pair of brush heads (1) is integrally formed by using a food-grade silica gel type of soft material respectively. The pair of brush heads (1) performs 360-degree rotation in opposite directions. A back-flushing plate (4) is provided at a back of the pair of brush heads (1). End portions of the transmission rods (5) are lower than an end portion of the brush heads (1). A top end of the back-flushing plate (4) is lower than top ends of the brush heads (1).
