The main manifestations of dental implant failure are as follows: 1. Bleeding. If the blood vessels in the bone are touched or pierced out of the bone wall during the procedure, causing the blood vessels to rupture, massive bleeding under the mucosa or subcutaneous will occur, etc. 2. Numbness of the lower lip. The numbness of the lower lip will occur when the important nerve is not avoided by a safe distance of 2mm during the preparation of the cavity and the nerve is continuously compressed. 3.Wound dehiscence. As there is no soft tissue relaxation, the implant is not completely covered, which may cause implant instability or even dislodgement or infection. 4. Loosening of implant due to implant rejection reaction, including implanted bone powder, periosteum, titanium mesh, titanium nail, implant, etc. 5. Loosening of implant abutment occurs after restoration. The gap between the denture restoration and the implant is created, and the restoration appears to rotate and loosen. 6. The abutment of the implant fractures. The implant abutment is directly separated from the implant along with the restoration. 7. Peri-implantitis. The gum around the implant is edematous and congested, the bone around the implant is resorbed, and the implant denture becomes loose, resulting in the loss of the implant, etc.