The sawtooth shovel takes its name from the sharp teeth that run along its blade. While it isn't a tool you'll use every day, it can ease the backbreaking work that heavy gardening sometimes requires.
If you're digging up a large bush or shrub that you don't want to grow back, for example, a sawtooth shovel can help you get the job done. The sharp teeth are designed to cut through roots with ease.
This serrated edge will save you time and energy compared to a standard rounded shovel, especially since you may have to use a second tool to cut through strong roots.