Abstract: A suction device such as a dental aspirator comprises a plastic tube (10) with a plurality of suction orifices (21). In accordance with the invention, at least one portion of the tube is provided with ridges and intermediate grooves (20). A plurality of small suction orifices (21) are made at least at the bottoms of the grooves, these orifices lying protected against clogging by the mucous membrane in the patient's oral cavity. The ridges and grooves comprise bellows-like folds with sides (16, 17) of different extension, so that the narrower sides (16) can be snapped in under the wide sides (17) when compressing the bellows-like portion.