Mortar joints in brick, block, or stone will only last for so long. It is one of the most common repairs by mason contractors. When it starts deteriorating it should be fixed professionally. This process involves removing the old mortar to the proper depth, removing any broken or cracked brick, block, or stone, replacing with new as closely as possible to existing, and matching the new mortar as closely as possible to existing. This process will leave you with a project that will compliment your masonry for years to come.