Semi-fixed dental implants can be used for 1 to 3 years if the periodontium is poor, the semi-fixed part may need to be replaced if the daily maintenance is good for a few years, and the alveolar bone can be used for a long time if the alveolar bone is in good condition, so it is recommended to go to the hospital regularly for checkups and maintenance of periodontal health. Semi-fixed dental implants are mostly implants connected with precision attachments to form semi-fixed restorations, which are not easy to fall off and are more stable. Semi-fixed dental implants may only be used for 1 to 3 years if the periodontal conditions are poor, the alveolar bone shrinks heavily or the implant and the alveolar bone do not heal well when the implant is loaded prematurely. If the patient’s daily maintenance is good and the implant is well bonded to the alveolar bone, it may be necessary to replace the semi-fixed portion after a few years in order for the prosthesis to be stable due to age-related atrophy of the alveolar ridge. Semi-fixed dental implants with good alveolar bone condition can be used for a long time due to accidental tooth loss.