A tool for a dental treatment, namely a scaler, comprising a transducer having at least one piezo element for causing a vibration movement along a vibration direction (VD) in a vibrating state, wherein the transducer , in particular a sonotrode of the transducer , includes an irrigation fluid channel for transporting an irrigation fluid, wherein a supply line passes through the transducer and wherein an interface between the supply line and the irrigation fluid channel of the transducer is located downstream to the at least one piezo element , wherein the supply line passes through a back mass of the transducer, wherein the tool comprises a channel modifying section being passed by the irrigation fluid during operation of the tool , the channel modifying section being formed by -- an inner wall section of the irrigation fluid channel being slanted relative to the vibration direction (VD) about an angle between 30° and 150° and/or -- an interface between a supply line and the irrigation fluid channel of the transducer , wherein for reducing an influence of a vibration of the transducer to the irrigation fluid during the operation of the tool a ratio of - a distance (D1, D2) between the channel modifying section and the at least one piezo element , measured in a direction parallel to the vibration direction (VD) to - a total length (L) of the transducer , measured in a direction parallel to the vibration direction (VD), is smaller than 0.15 and preferably smaller than 0.1. wherein the transducer , in particular a sonotrode of the transducer , includes an irrigation fluid channel for transporting an irrigation fluid, wherein a supply line passes through the transducer and wherein an interface between the supply line and the irrigation fluid channel of the transducer is located downstream to the at least one piezo element , wherein the supply line passes through a back mass of the transducer, wherein the tool comprises a channel modifying section being passed by the irrigation fluid during operation of the tool , the channel modifying section being formed by -- an inner wall section of the irrigation fluid channel being slanted relative to the vibration direction (VD) about an angle between 30° and 150° and/or -- an interface between a supply line and the irrigation fluid channel of the transducer , -- an inner wall section of the irrigation fluid channel being slanted relative to the vibration direction (VD) about an angle between 30° and 150° and/or -- an interface between a supply line and the irrigation fluid channel of the transducer , wherein for reducing an influence of a vibration of the transducer to the irrigation fluid during the operation of the tool a ratio of - a distance (D1, D2) between the channel modifying section and the at least one piezo element , measured in a direction parallel to the vibration direction (VD) to - a total length (L) of the transducer , measured in a direction parallel to the vibration direction (VD), - a distance (D1, D2) between the channel modifying section and the at least one piezo element , measured in a direction parallel to the vibration direction (VD) to - a total length (L) of the transducer , measured in a direction parallel to the vibration direction (VD), <EOS>