I had the same problem with an implant that started a couple of years after I had it done. An oral irrigator like hydro floss or water pik with antiseptic mouthwash (listerine) or hydrogen peroxide seemed to be the only thing that helped but I still had some smell and taste. Finally I found a dentist that would have the knowledge and confidence to fix it.
She did two things:
1. Did research to make sure the screw that previous dentist used was the right one, the wrong screw will screw in but leaves gaps which allow bacteria to grow and cause the nasty taste in your mouth. It was the wrong screw.
2. She zapped the tissue around the implant with an electric device. Not sure what its called. She said the abutment might not have been flush against the implant which could have caused the bacteria to build up as well.
Check online for dentists with a lot of implant experience, websites like dr. oogle are good. My dentist is Dr. Grimm in Austin,TX. She's incredible.
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Posted to Why Do I Suddenly Notice a Foul Odor Near my Implant Gumline? on 13 Jan 2013