A dispensing device for a dental substance, comprising - an outlet for the dental substance, and - a valve for opening and closing the outlet, and - a cannula for connection with the outlet, - the device being operable between a storage mode and an operative mode, - wherein the valve comprises a valve body comprising the outlet and a valve element comprising a sealing surface for sealing with the valve body and a conduit, wherein the valve body and the valve element are rotatable relative to one another between an open position in which the conduit is in fluid communication with the outlet so that the outlet is open, and a closed position in which the sealing surface seals the outlet so that the outlet is closed, - wherein the valve element has a generally cylindrical outer surface, and the valve body has a generally cylindrical inner surface, with the outer surface of the valve element and the inner surface of the valve body being mated with one another, such that the valve body and the valve element are rotatable relative to one another around a rotation axis (R, R'), - the valve element being adapted to receive an end of the cannula such that the cannula is in fluid communication with the conduit and therefore in the open position of the device the cannula is connected to the outlet, and substance dispensed from the outlet is guided through the conduit into the cannula, - wherein the device is further adapted such that in the operative mode the valve opens the outlet, and the cannula, when it is present, is locked in the device, and - wherein the device is adapted such that in the storage mode the valve closes the outlet, and the cannula, when it is present, is released from the device, the dispensing device being characterized in that it is adapted - such that activating the operative mode causes the valve to open the outlet and locking the cannula, when it is present, in the device, and - such that activating the storage mode causes the valve to close the outlet and releasing the cannula, when it is present, from the device. - an outlet for the dental substance, and - a valve for opening and closing the outlet, and - a cannula for connection with the outlet, - the device being operable between a storage mode and an operative mode, - wherein the valve comprises a valve body comprising the outlet and a valve element comprising a sealing surface for sealing with the valve body and a conduit, wherein the valve body and the valve element are rotatable relative to one another between an open position in which the conduit is in fluid communication with the outlet so that the outlet is open, and a closed position in which the sealing surface seals the outlet so that the outlet is closed, - wherein the valve element has a generally cylindrical outer surface, and the valve body has a generally cylindrical inner surface, with the outer surface of the valve element and the inner surface of the valve body being mated with one another, such that the valve body and the valve element are rotatable relative to one another around a rotation axis (R, R'), - the valve element being adapted to receive an end of the cannula such that the cannula is in fluid communication with the conduit and therefore in the open position of the device the cannula is connected to the outlet, and substance dispensed from the outlet is guided through the conduit into the cannula, - wherein the device is further adapted such that in the operative mode the valve opens the outlet, and the cannula, when it is present, is locked in the device, and - wherein the device is adapted such that in the storage mode the valve closes the outlet, and the cannula, when it is present, is released from the device, the dispensing device being characterized in that it is adapted - such that activating the operative mode causes the valve to open the outlet and locking the cannula, when it is present, in the device, and - such that activating the storage mode causes the valve to close the outlet and releasing the cannula, when it is present, from the device.