Final answer:
Cream lighteners are best for scalp application due to their thicker consistency which allows for precise and controlled application.
Step-by-step explanation:
The lighteners that have a thicker consistency and give more control during scalp application are cream lighteners. Cream lighteners are designed to be gentle on the scalp and are often used for on-scalp lightening techniques due to their thicker, more controllable consistency compared to other types of lighteners. This allows for precise application and helps to prevent the product from running or spreading to unwanted areas during the lightening process. In contrast to cream lighteners, powder lighteners are generally not as thick and may require careful handling to avoid scattering the product, while oil lighteners are typically used for off-scalp techniques, and liquid lighteners are more fluid and can be less controllable.