Common complication seen in a patient of osteopetrosis during extraction is:

Medullary spaces of jaws are remarkably reduced in both forms. Osteomyelitis and jaw fracture is common during tooth extraction. Key concept: Osteomyelitis of the mandible is common due to a deficient blood supply. Bones are fragile and can fracture easily.  Ref: Shafer's textbook of oral pathology 7th edition page 704