A foldable toothbrush having a self-contained storage compartment contiguous with the body of the toothbrush. A pair of storage compartments are connected to one another, one of which is, in turn, connected to an arm assembly. The arm assembly has a pair of members connected to each other. The toothbrush's bristles are attached to the outermost member of the arm assembly. In its fully folded position, the arm assembly's members fold down on one another to form a folded arm section which is folded into one of the storage compartments. The other storage compartment folds down onto the first storage compartment to yield a small, flat, cylindrical case which houses the toothbrush which can easily be stored in a purse or pocket. The foldable toothbrush is designed to be inexpensive enough to be disposable but sturdy enough to withstand repeated use.