What exactly are the "complications" that occur with tear trough implants?

I don’t place tear trough implants because I believe you get a more natural and just as long-lasting effect with well-executed fat grafting. However, implants can be safe as long as they are placed by an oculoplastic surgeon with stellar credentials who can show you evidence of prior successful implants. Risks for this procedure are no different than for any surgery; minimal in most cases. I hope this helps.

Tear trough implants are very safe when done properly. There are not risk free but chances of removal is low. See following website link for more details. Skype consult available.

The rate of complications with tear trough implants are no greater than any other facial implant. When placed through an open lower blepharoplasty incision and secured with microscrews, their complication rate is very low. The key to their use is that their shape and thickness matched the infraorbital problem the patient need solved.