During the consultation process, many patients ask under what circumstances implantation is not possible. The contraindications to implantation at the current level of medical care are relatively few and are categorized into absolute and relative contraindications. If the patient’s condition is categorized as absolute contraindication, then the possibility of implantation is not great, and implantation will not be considered in the current situation, and if it needs to be repaired, then it needs to adopt the traditional restorative methods; if the patient’s condition is categorized as relative contraindication, then it can be implanted by creating the conditions for implantation, and implantation can be adopted, and relative contraindications will be gradually reduced under the doctor’s efforts. Today we briefly introduce the relative contraindications to dental implants. Certain systemic diseases can be subjected to implant surgery after treatment or under conditions of adequate preparation. When specifically evaluating whether certain diseases are relative contraindications, it is best to have an oral implantologist determine this.