Frequently Asked Questions Where and how can I use the facial trimming head (8 mm)? The facial attachment allows you to remove single hairs from visible areas on your face, such as your forehead, cheeks, above the upper lip and your eyebrows. How to use: If the body trimmer is attached, remove it and put the facial attachment on the trimming head. Switch the trimmer ON (pic. 1-3). Place the facial attachment gently on your skin and move it slowly against the direction of hair growth.