An adjustable dental implant comprises an implant body, a connecting structure, and two wings. The implant body comprises a fixture and an abutment. The fixture comprises a top, a bottom, a peripheral surface connected between the top and the bottom, and a joining portion formed on the peripheral surface. The abutment is set on the top of the fixture. The connecting structure is set between the fixture and the abutment. The wings are pivotally connected with two opposite sides of the connecting structure. Or, one of the wings is pivotally connected with the connecting structure, and the other wing is fixed with the connecting structure. The wing or the wings may be adjusted to fit the surface of the cortical bone. Dental posts are allowed to penetrate the alveolar bone entirely to secure the fixture.