Final answer:
The oval-shaped electrode is typically used with a Tesla high-frequency current on the face, providing even coverage and therapeutic effects like improved circulation and skin rejuvenation.
Step-by-step explanation:
When using a Tesla high-frequency current on the face, the shape of electrode typically used is oval. This shape is preferred because it conforms well to the facial contours, allowing for even distribution of the current over the treatment area. Electrodes of different shapes can be used depending on specific treatment needs, but for overall facial treatment, the oval shape is the standard.
The Tesla high-frequency current is a type of alternating current, which has therapeutic effects including improved circulation, oxygenation, and potential skin rejuvenation due to the stimulation of thermal and electrical nerve responses. It's important to use the appropriate shape and size of an electrode to ensure a safe and effective treatment.