When it comes to complications in implant dentistry, classification is based on three main parts designed so that each one of them connects to the other two and are mutually intertwined. The first part refers to procedures which need to be taken with the purpose of reducing the risks of making complications. Each operation should start with anamnesis which shows whether there are contraindications which may endanger surgical operation, and are followed by plan making. Patients with restrictions such as lack of bone marrow undergo the procedures of bone augmentation. The most common reason for augmentation in the upper jaw are low recesus of maxillar sinuses when sinus lift is needed, while in atrophic lower jaw the augmentation of ridge is done. Modern implant dentistry uses CBCT, which is seen as gold standard. Intraoperational complications of an inexperienced doctor happen because of not having enough respect of anatomic restrictions which can be found in all directions depending on the jaw. The existing teeth or implants make the meziodistal border, cortical plates buccolingual while apically nasal cavity and maxillary sinus in the upper and mandibular canal in lower jaw. After the implantation there is always a loss of marginal bone height which is considered a physiological feature if it remains within the frame of dimensions which make 0.2 mm per year. There are several techiques of keeping the bone height of which some are less and some more successful. The loss of implants can occur early when it is caused by traumatic treatment while making the implant bed, when the prosthetic burden happens too soon, when work is done in nonsterile conditions and there are other reasons which lead to lack of osseointegration. Later loss of implants is most commonly caused by periimplatitis and inadequate prosthetic solutions when the implant is overburdened and also, the implant can break in the bone.