Which type of current is not used in galvanic treatments?

In galvanic treatments, direct current is specifically utilized because it involves a continuous flow of electric charge in one direction, which is essential for the physiological effects desired in these treatments, such as iontophoresis. During galvanic procedures, the direct current helps to facilitate the penetration of active ingredients into the skin by using positive and negative electrodes.

Alternating current, on the other hand, periodically reverses direction and is not suitable for the specific ionization processes that galvanic treatments employ. High-frequency current also differs significantly in its application, as it is generally used for its thermal and antibacterial effects rather than for the direct ion movement central to galvanic treatments.

Thus, the correct choice regarding the type of current not used in galvanic treatments is the alternating current. This distinction is important to understand when studying the various current types and their specific applications in esthetic practices.