A gum massaging device includes upper and lower curve plates and upper and lower massage plates. The upper and lower curve plates are used for contacting upper and lower rows of teeth once the gum massaging device is inserted into a mouth of a user. The upper and lower curve plates have C-shaped structures with inner ends connected to each other and outer ends spaced apart from each other so as to define a gap between the outer ends. The upper and lower massage plates are mounted respectively on the upper and lower curve plates in such a manner that the upper and lower massage plates are adapted to contact upper and lower gums of the upper and lower rows of teeth to provide massaging effects once the upper and lower massage plates are pressed against the upper and lower gums.
