In dentistry complications are undesirable adventures provoked by oral health care delivery. If there is any risk of a complication, the patient needs to be informed before treatment. Occurrence of complications can be minimized by adequate diagnostics and planning sufficient time for treatment. The most common complications during and after dentoalveolar surgery are discussed, such as complications during or after producing local anaesthesia, nerve injuries, complications during or after tooth extraction, aspiration, jaw luxation, disturbed wound healing, and complications during or after implantation procedures.