An attachment denture is a removable denture that uses an attachment (or contains an attachment) to provide retention. The attachment is a mechanical device that holds the body removable denture to the fixed denture and consists of two parts, one on the fixed denture and one on the removable denture, which fit together to give retention and support to the removable denture. The advantages of an attachment denture are aesthetics, comfort and function. With conventional removable dentures, the retention is provided by metal clasps, so the chewing function is poor. The metal rings are also unattractive for positions closer to the front teeth. This is when the precision-attachment denture was born. It makes precision pins, locks, caps and other retention devices on the remaining teeth to achieve effective retention of the denture without the retaining ring, which is more beautiful and comfortable. It is now the main direction of movable denture restoration abroad. When there are only a few teeth left in the patient’s mouth, if the use of conventional rings (commonly known as metal “hooks”) retaining dentures, the remaining teeth will be subject to a lot of torque, and the denture seal will also be affected, and thus the denture in the oral cavity is not good retention, so patients to the Department of Dentistry examination and treatment, the general doctor will recommend that patients remove the remaining teeth to do full denture repair. The magnetic attachment prosthetic technology is a good combination of the traditional removable denture and the magnetic attachment system, which represents the most advanced technology in the world. The magnetic attachment system consists of a pair of dissimilar magnets, one pole of which is embedded in the denture and serves as a retainer. The other pole is fixed in the root of the tooth and is called the armature. When the denture is worn in the mouth, the suction of the magnets gives the denture a good retention force, which is more beautiful and comfortable than the traditional retainer type removable denture, with better retention force. This technology is especially suitable for patients with missing teeth whose roots are left in the mouth but whose alveolar bone is severely atrophied and difficult to be restored by traditional methods. At the same time, it helps to preserve the remaining roots in the mouth, avoid extractions as much as possible, and prevent alveolar bone atrophy. The magnetic retention overdenture technique is a good solution to the contradiction of preserving the remaining abutment teeth and reducing the force on the abutment teeth, while providing sufficient retention for the denture. The advantages are: no metal exposure, beautiful appearance; good retention, comfortable wear; use of residual roots and crowns, reducing extractions; and the production of porcelain crown bridges to protect the abutment teeth.