Infections can occur at the implant site if the area isn't cleaned properly before the implant is placed.
Nerve damage can cause pain, numbness, or tingling in the gums, lips, chin, or natural teeth.
Sinus problems If the implant is placed in the upper jaw, it can protrude into a sinus cavity.
The implant may become loose or shift over time, which can be uncomfortable and affect the implant's appearance.
Peri-implantitis This is a type of periodontal disease that can occur around the implant and lead to bone loss and implant failure if left untreated.
Implant fractures-Implants can fracture due to trauma, overloading, or poor bone quality.
Allergic reaction-An allergic reaction to the metal can cause irritation, pain, or tenderness around the implant. In severe cases, the implant can loosen or cause system-wide symptom
This question is really very comprehensive and as Dr. Liu Xue mentions, among the problems, Dr. Muhammad Shakeel Khawaja was very happy to point out several immediate and mediate ones. In my opinion, today with access to products (implants, grafts, etc.) it has been instilled that implant installation and rehabilitation procedures are easy and predictable. I understand that surgical tactics (set of measures related to data collection, case analysis and procedures) are procrastinated and the lack of experience of colleagues, especially in the first surgeries, leads to complications that often lead to discrediting the professional as well as the implant treatment. Few educational studies talk about the need for prior training and complications, as this topic does not seem to be of interest to research funders, industry and the market. The professionals who pay for this type of study are through trial and error, leading to emotional exhaustion and discouragement. When a colleague makes a mistake, the criticism and punishment are severe. Often embarrassing for the professional, causing their results to be hidden.