I get a version of this question in my office at least once a week, so let's talk about it properly.
Here's the situation, roughly: you got an implant placed a couple months ago, another one a year ago on the other side, and only the newer one is acting up — swelling, bleeding when you chew on that side, starting about a week ago. The older implant is behaving fine. So what gives?
Why would only one implant act up?
This trips people up because they assume if something's wrong, it's a "them" problem — like they're just bad at brushing. It's rarely that simple. A few things make one implant site more vulnerable than another:
- Location. Lower back molars are notoriously harder to clean — your brush just doesn't reach the same way.
- Time since placement. At two months, gum tissue is still maturing — more reactive to plaque than a site that's had a full year to settle.
- Bite pressure & food impaction. A tighter contact with the neighboring tooth wedges food in more, triggering a swelling-bleeding cycle.
So no — it's very unlikely you're doing something fundamentally wrong. It's much more likely this one spot is simply harder to keep clean.
What's probably going on, medically
What you're describing lines up with peri-implant mucositis — the implant version of gingivitis: inflammation limited to soft tissue, no bone loss yet. Good news: this stage is reversible with proper cleaning, often plus a professional visit.
Mucositis
Soft-tissue swelling & bleeding only. No bone loss. Reversible with cleaning.
Peri-implantitis
Bone loss begins. Often little to no pain warning. Needs prompt treatment.
Does this mean the implant is failing?
Not necessarily. This is genuinely one of the more common and treatable complications in implant dentistry, especially caught within the first week or two like you have. Implants can't get cavities — no natural tooth structure to decay — but they absolutely can accumulate plaque and tartar around the base, just like a real tooth, and that's what's driving this.
What I'd actually tell you to do
"Wait and see" is exactly how mild inflammation quietly turns into something requiring surgical treatment. Get it looked at this week, not in a month.
Interdental brush or floss threader
Right at the implant site specifically, not just general brushing.
Water flosser, angled at the gumline
Flushes out debris a brush physically can't reach around the implant crown.
3–4 month recall, not 6
Peri-implant disease progresses faster and more silently than regular gum disease.
The bottom line
What you're dealing with sounds like early-stage inflammation around the implant — one of the more fixable situations in implant care. But "fixable" comes with a time limit. Catching it now, while it's still just soft tissue, is a completely different situation than catching it six months from now. Get it checked, tighten up the cleaning routine around that specific spot, and ask about shortening your recall interval for that implant.
Related reading
A few related questions come up alongside this one: removing a wisdom tooth that isn't causing pain and food repeatedly getting trapped around an implant. Also worth reading: deciding whether severe tooth pain is a true emergency and how long All-on-X implants typically last. For the broader topic list, see the full dental topics index.