Pasty or creamy substance dispenser

A pasty or creamy substance dispenser comprising an elongate bottle defining a cylindrical chamber fillable with a pasty or creamy substance and having a first end and a second end, a piston sealedly movable within said chamber and closing its first end, a profiled wall integral with said bottle and closing the second end of its chamber, at least one aperture provided in said profiled wall, a non-return valve provided in correspondence with said aperture to enable said substance to emerge from the cylindrical chamber, an elastically deformable cap mounted on said bottle in correspondence with said profiled wall and defining therewith a compression valve chamber for said substance, a hole provided in the cap for the exit of said substance from the compression chamber, and at least one closure element for said hole, which is closed when in the rest state and is opened by manual deformation of said cap, characterised in that said profiled wall is elastically deformable, a portion thereof forming at least one hollow appendix extending into said compression chamber, said aperture being provided in at least one of said hollow appendices, the end of one hollow appendix constituting said closure element for the hole in the deformable cap, said non-return valve comprising a flexible tab projecting from the cap and into the interior of the compression chamber to overlie said aperture and resting on and slidable along the surface of the appendix in which the aperture is provided, that end of the appendix facing the hole in the deformable cap being withdrawn from the hole when the cap is manually deformed with consequent elastic deformation of said profiled wall under the thrust of the substance present in the compression chamber.