Which of the following services temporarily removes facial hair one at a time?

The correct answer is that tweezing is the service that temporarily removes facial hair one at a time. Tweezing involves using a pair of tweezers to grasp and pull out individual hair strands from the follicle. This method provides precision, allowing for targeted removal of specific hairs, making it particularly effective for shaping eyebrows or removing stray facial hairs.

In contrast, waxing removes a larger area of hair at once by applying a sticky substance that adheres to multiple hair strands, pulling them out simultaneously when the wax is removed. Threading is a technique that uses a twisted thread to trap and remove multiple hairs in a line, which can cover a broader area, such as eyebrows or upper lips, in just a couple of moves. Shaving, while effective for temporary hair removal, typically cuts hair at the surface level without pulling it from the root, making it a different method entirely.

Therefore, the unique quality of tweezing lies in its ability to focus on one hair at a time, which is why it is the correct choice for this question.