Final answer:
The number of strokes required with an abrader can vary depending on the material and desired outcome.
Step-by-step explanation:
Abraders are used in dentistry to remove tooth structure during dental procedures.
However, in the context of your question, it seems like you may be referring to abraders used in traditional native American arts and crafts, which are typically made of sandstone and used to shape or smooth surfaces.
The number of strokes required with an abrader for an effective result can vary depending on the material being abraded and the desired outcome.
For example, more strokes may be needed to remove a larger amount of material or to achieve a specific shape.