A hair comb and applicator device (1) is disclosed, comprising: a body (10, 20) enclosing a reservoir (5) for containing a hair treatment substance; a plurality of teeth (40) arranged in at least one row; and a roller (30), rotatably mounted within the body, to transfer hair treatment substance from the reservoir to hair during use. The body includes a wall 60 comprising: a concave inner surface (64) providing a seat for the roller and a convex outer surface (61) from which the plurality of teeth (40) extend. A plurality of through slots (62) are provided in the wall (60), the slots (62) being interposed between the plurality of teeth (40) and wherein each slot (62) extends as an arc along the wall.
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