Some people do have a higher risk of dental implant complications, and possible risk factors include:
Smoking can increase the risk of peri-implant disease
A previous history of periodontal disease
Poorly controlled diabetes although people with well-controlled diabetes can often have successful dental implant treatment
Untreated bruxism, where the patient clenches and grinds, placing excessive stress on the implants which in turn causes implant bone loss
Factors that do not increase the risk of dental implant complications include gender and age.