Yes, it is possible to resharpen and repair circular saw blades under certain conditions. Circular saw blades can become dull over time with use, resulting in reduced cutting performance. Sharpening the blade can help restore its cutting ability and prolong its lifespan. However, it's important to note that not all circular saw blades are designed to be sharpened. Some lower-quality blades may not have enough material to be effectively resharpened, or they may have other design features that make resharpening impractical or uneconomical.

If you have a high-quality circular saw blade that is suitable for resharpening, there are a few methods you can use. One common approach is to use a specialized saw blade sharpening tool or a grinding wheel designed for sharpening blades. These tools allow you to carefully remove the dull edges and reshape the teeth to their original sharpness. It's important to follow the manufacturer's instructions and take proper safety precautions when using these tools.

Alternatively, you can send your circular saw blades to a professional saw blade sharpening service. These services have the expertise and specialized equipment to sharpen blades effectively and ensure they maintain their proper shape and balance.

As for repairing circular saw blades, it depends on the extent of the damage. Minor issues such as chipped teeth can sometimes be repaired by reshaping or replacing the damaged teeth. However, if the blade has significant damage or if the carbide tips are worn out, repair may not be feasible, and it may be more cost-effective to replace the blade.

Remember to always refer to the manufacturer's guidelines and recommendations for maintaining and servicing your specific circular saw blades, as the procedures may vary depending on the blade type and brand.