Final answer:
When using a brush machine on a client's face, it is important to select a brush that is suitable for their skin type and the desired outcome.
Step-by-step explanation:
When using a brush machine on a client's face in the field of beauty and cosmetology, it is important to select a brush that is suitable for the client's skin type and the desired outcome.
For example, a soft bristle brush is typically used for applying powders or blending products on sensitive skin, while a dense bristle brush may be used for exfoliation or applying creams.
Therefore, the type of brush to select depends on factors such as the client's skin type, the purpose of the treatment, and the desired effect.