Clean the crack with a wire brush and remove all loose debris
Widen the crack slightly with a chisel if needed for better adhesion
Vacuum out dust and dirt from the crack
Dampen the crack if using a cement-based repair product
Apply a concrete crack filler, patching compound, or epoxy according to the product instructions
Force the repair material deep into the crack with a putty knife or trowel
Smooth the surface level with the surrounding concrete
Allow the repair to cure fully
Seal the repaired area with a concrete sealer if recommended
Monitor the crack for movement or widening
Use flexible sealant for cracks that expand and contract
Hire a professional if the crack is wide, growing, or caused by structural damage