2 year old chin implant doesn't feel stable - should I be concerned?

It is possible that the implant has migrated due to lack of screw fixation so I would get a CT scan to evaluate the implant position. Once an implant has been in for a few months it will become encapsulated and therefore should not move unless it has migrated off of the bone. It can easily be removed and replaced or even repositioned.

Your surgeon’s choice not to use a screw to attach it to the bone could contribute to the sensation of movement. However, only a healthcare professional with access to your medical history and the ability to examine you in person can provide accurate advice about the stability and potential issues with your chin implant.

Best of luck !

It doesn’t sound like there’s anything wrong with your chin implant. It would be of some relevance, knowing what material the implant is made out of. The crunchy sensation or sound may represent a fracture in the implant, if it is made out of a porous material such as medpor implants.
This sensation would be less likely if the implant was made out of a more flexible material such as silicon rubber.
Best,
Mats Hagstrom, MD