What is the effective method of epilation that utilizes a water-soluble paste?

The effective method of epilation that utilizes a water-soluble paste is sugaring. Sugaring involves the use of a paste made typically from natural ingredients such as sugar, lemon juice, and water. This paste can be applied to the skin and then removed in the direction of hair growth, making it less harsh on the skin compared to other methods.

Sugaring is known for its ability to remove hair more gently than traditional waxing because the paste adheres only to the hair and not the skin, which can help minimize discomfort and irritation. Additionally, because the ingredients in sugaring are usually gentle and primarily composed of natural substances, it is often considered a better option for sensitive skin, providing an effective and safer epilation method.

In contrast, other methods like waxing use a polymer-based resin that requires a separate adhesive process, threading relies on physical entwining of the hair with thread, and shaving removes hair at the skin surface without extracting it from the follicle, which does not constitute true epilation. Therefore, sugaring stands out as the correct answer for this question about a water-soluble paste method in epilation.