

Human: I have some cracks in my brick house from settling, how do I fix them?

Assistant: If the cracks are only a few millimeters in size, you can patch them by putting a new mortar mix in them and spreading it around, and letting it dry. After it’s dried, you can sand it until it is flush with the surrounding brick.

Human: Do I need to chisel out the old mortar?

Assistant: 
You should chisel the old mortar out until you see what color it was, and sand the old mortar out until it’s flush with the new mortar.
No, the mortar will come out pretty easily.