How long do cheek implants last?

The silicone cheek implants are made to last your lifetime.  More than likely you will take them with you to the grave.  Especially if the implants are the harder variety and screwed into place, your risk of shifting is very  minor.  Although anything having to do with inserting metal into bone run the risks of infection and bone deterioration.  Do be advised though pressure of the implant can cause bone resorption under the implant, especially with silicone implants.  Then again, everything is dependent upon the individual and as you should know there is no "never" or "definite" in medical science.