Which fingers are used when treating the upper lip?

The thumb and index fingers are commonly used when treating the upper lip due to their dexterity and ability to provide precise control. The thumb offers a stable base for applying gentle pressure or manipulation, while the index finger allows for targeted movements and is well-suited for detailed work in smaller areas such as the upper lip. This combination enables the practitioner to effectively manage the treatment, ensuring both precision and comfort for the client.

The other options do not necessarily align with optimal techniques for this specific area. For instance, using fingers that aren't suited for detailed work may limit the practitioner's ability to apply the necessary techniques effectively. The thumb’s opposition to the index finger also creates a strong grip which is essential for achieving the desired outcomes in facial treatments. Thus, the choice of thumb and index is the most efficient and effective method for treating the upper lip.