A portable interdental toothbrush (A) comprising: a cleaning solution tube (1) having a filling space (11) filled with a cleaning solution and a discharge hole (12) for discharging the cleaning solution ； and a brush body (2) in which a fixing part (21) snapped into the discharge port (12) of the cleaning solution tube (1) is formed at one end and a brush (22) is attached at the other end, in which a plurality of exhaust grooves (211) are formed in the fixing part (21) of the brush body (2) in the longitudinal direction of the fixing part (21) in such a way that the cleaning solution (C) is discharged into the brush (22) along the exhaust grooves (211) of the fixing part (21) when a pressure is applied to the cleaning solution tube (1), characterized in that a plate (211a) is formed on an outer surface of the exhaust grooves (211) of the fixing part (21) of the brush body (2) in a direction inclined towards the outer brush (22), and the plate (211a) is adapted to discharge the cleaning solution (C) when a pressure is applied to the cleaning solution tube a (1) and to prevent the cleaning solution (C) from discharging when no pressure is applied to the cleaning solution tube (1), or fine bristles (211b) are formed by extending into the exhaust slots (211 ) on the outer surface of the exhaust grooves (211) of the fixing part (21) of the brush body (2).Un cepillo de dientes interdental portátil (A) que comprende: un tubo de solución de limpieza (1) que tiene un espacio de llenado (11) lleno con una solución de limpieza y un orificio de descarga (12) para descargar la solución de limpieza； y un cuerpo de cepillo (2) en el que una parte de fijación (21) ajustada a presión en el orificio de descarga (12) del tubo de solución de limpieza (1) está formada en un extremo y un cepillo (22) está unido en el otro extremo, en el que una pluralidad de ranuras de escape (211) están formadas en la parte de fijación (21) del cuerpo de cepillo (2) en la dirección longitudinal de la pa
