The device basically comprises a comb for selecting the locks of hair to be treated from a section of hair, in addition to a container provided with at least one compartment that can contain at least one liquid or pasty product for dyeing or bleaching. Said comb is partially introduced into the container and can be moved inside same, along the length thereof, the comb being coupled to the container in such a way that it moves when the device is in an operating position, generating the gradual insertion of a larger and larger portion of the locks selected by the comb into the container at the same time as the inside of the compartment gradually opens up and communicates with the inserted portion of locks, exposing said portion to the liquid or pasty product.
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