Final answer:
Tooth buckets on mini and large excavators are primarily used for excavation and digging purposes.
Step-by-step explanation:
Tooth buckets on mini excavators and large excavators are primarily used for excavation and digging purposes. These buckets are designed with sharp teeth or blades that can penetrate and scoop through various materials such as soil, rocks, and debris. The teeth on the bucket provide extra gripping power to break through tough surfaces, while the bucket itself can hold and transport the excavated material.