A dental floss stick comprises a rod body, a first extension arm, a second extension arm, a horizontal floss unit and an inclined floss unit. The second extension arm is spaced apart from the first extension arm and cooperates with the first extension arm to jointly define a clean space. The horizontal dental floss unit is located in the clean space, and includes a first horizontal dental floss connecting the first extension arm and the second extension arm. The inclined dental floss unit is located in the clean space, is inclined to the horizontal dental floss unit, and includes a first inclined dental floss and a second inclined dental floss respectively located above and below the first horizontal dental floss. There is a gap between the horizontal dental floss unit and the inclined dental floss unit sufficient to generate capillary phenomenon.一種牙線棒，包含一個桿體、一個第一延伸臂、一個第二延伸臂、一個水平牙線單元及一個傾斜牙線單元。該第二延伸臂與該第一延伸臂相間隔設置並與該第一延伸臂相配合共同界定出一個清潔空間。該水平牙線單元位於該清潔空間，並包括一條連接該第一延伸臂及該第二延伸臂的第一水平牙線。該傾斜牙線單元位於該清潔空間，且傾斜於該水平牙線單元並包括分別位於第一水平牙線的上方及下方的一條第一傾斜牙線及一條第二傾斜牙線。該水平牙線單元與該傾斜牙線單元間具有足以產生毛細現象的間隙。
