Final answer:
The fine-tooth comb is used for cutting hair very close to the scalp, such as for sideburns and hairlines, due to its ability to provide precise control and guide scissors or clippers for even cuts.
Step-by-step explanation:
To cut areas very close to the scalp, such as sideburns and hairlines, you would typically use a fine-tooth comb. This type of comb allows for more precise control of the hair, which is essential when working in tight areas or when creating clean, sharp lines. The fine teeth of the comb can get very close to the scalp, providing a guide for the scissor or clipper to follow, ensuring that the hair is cut evenly and at the desired length. While other tools like a rat-tail comb can be used for sectioning and a pick comb for detangling, the fine-tooth comb is preferred for detailed and close cuts.