<human>:  How can I fix a cracking mortar between my bricks?
<bot>: To fix a cracking mortar between bricks, you should first clean away any loose or crumbling mortar with a wire brush or similar tool. Then mix new mortar, following the directions on the package. Apply the mortar with a masonry trowel and press it into the gap with a joint tool. Finally, allow the new mortar to dry and cure, usually overnight.