This article is general information for our patients, not a diagnosis. If something in your mouth hurts, changes, or worries you, have it examined.
Lose a tooth — to decay, a crack, gum disease, or an accident — and the question I hear most is whether it actually needs replacing. Sometimes yes, sometimes a reasonable no. What I weigh first is which tooth it is, what the rest of your teeth are doing, and what matters to you.
So hold onto one thing here: nothing below is a recommendation for your mouth. The right choice comes from reading the whole picture at once — which tooth is missing, the state of its neighbours, how much bone is there, how your bite meets, your health, and what you want — together, in the chair. Any one factor alone can point the wrong way. Use this to understand the trade-offs, not to land on an answer.
What a gap does when you leave it alone
A space is not a stable, finished state. Your mouth is a balanced system, and taking one part out lets the rest slowly rearrange. None of this is an emergency or overnight — but it is why I don’t like leaving the decision to drift.
The tooth behind a gap, a back tooth especially, tends to tip forward into it rather than slide across upright. The tooth in the opposite jaw, with nothing left to meet, can slowly grow out of its socket toward the space (“over-eruption”). Both open new ledges that trap food and plaque, so teeth that were fine become harder to clean and more prone to decay and gum trouble. And if that opposing tooth grows far enough in, replacing the original one later gets more complicated — sometimes the overgrown tooth has to be reshaped, have a root canal, or come out just to make room. Replacing promptly, or deliberately holding the space, is usually easier than untangling that later.
Underneath, the ridge of bone that held the root begins to shrink — not a sign anything is wrong, just the body treating bone it no longer needs as spare. Most of the change happens early: studies of healing sockets find the ridge can lose up to roughly half its width within the first year, with about two-thirds of that in the first three months, plus a few millimetres of height, before the loss slows to a trickle. The lower jaw tends to go faster than the upper. This matters because it narrows what is possible later: an implant needs enough bone to anchor into, and a denture grips a flattened ridge less well. It is why we sometimes pack the socket with a small bone graft when the tooth comes out (a “socket preservation” graft), or place an implant sooner rather than later — there is more in our guide to what to expect after a tooth is removed.
A single back tooth rarely changes how you eat or speak — your tongue, lips and cheeks adapt well. You feel it when losses stack up on one side, or when a front tooth goes: “f,” “v” and “s” sounds can shift, and the gap shows when you smile. Those are valid reasons to replace a tooth even when nothing hurts.
Do you have to fill every gap?
No — leaving certain gaps open can be a sound, research-backed choice, as long as it is made on purpose rather than by default. Dentistry calls it the “shortened dental arch”: a comfortable bite does not strictly need a full set of 28 teeth, and for many people, keeping the front teeth and the premolars just behind them — roughly ten pairs that meet — is enough to eat and smile well without replacing the very back ones.
Leaving a gap tends to make sense when the missing tooth is far back and does not show, the teeth you still have are healthy with a good outlook, and you would rather not take on the cost, surgery or upkeep. In my experience people won’t wear a replacement they don’t feel they need — a partial denture for back teeth often ends up in a drawer — so forcing one rarely helps. I would steer away from accepting gaps, though, if you have active gum disease or heavy tooth wear, if losing the back teeth is already straining your jaw joints, or if your bite leaves only two or three pairs of teeth actually meeting.
Your four options, side by side
Four realistic routes: a dental implant, a fixed bridge, a removable partial denture, or keeping the gap under review. Each trades cost, surgery and upkeep differently, and none is right for every situation. This is the comparison I would lay out in the chair.
| Option | Fixed or removable? | Neighbouring teeth | What to expect long-term | What it asks of you |
|---|---|---|---|---|
| Dental implant | Fixed | Left untouched | Roughly 95% still working at 10 years | Surgery, 3–6 months of healing, enough bone |
| Conventional bridge | Fixed | Trimmed down and crowned | Around 85% still in service at 10 years | Permanent reshaping of two neighbouring teeth |
| Resin-bonded (glued) bridge | Fixed | Little or no drilling | About 85% at 5 years, closer to 60% by 10 | Accepting it may come unstuck and need re-bonding |
| Partial denture | Removable | Held with small clasps, not drilled | Relined or remade as the ridge changes, often within 5–10 years | Careful daily cleaning, out at night |
| Leaving the gap | Neither | May drift over time | Can stay stable for years in the right mouth | Monitoring at every check-up |
Those survival figures are rough ranges from long-term studies, not promises. On cost, an implant is usually the largest upfront and a partial denture the smallest, with bridges in between — but fees depend on your mouth, so we quote only after an examination.
A dental implant
A small titanium post placed into the jaw as an artificial root, with a crown built onto it — it replaces a single tooth without touching its neighbours. After placement it needs to knit to the bone (osseointegration), usually three to six months before the final crown goes on. It needs enough healthy bone to anchor into, which is partly why that early shrinkage matters, and because it is surgery, your general health comes into play. Smoking lowers the odds: in one long-term comparison about 89% of implants succeeded in smokers versus 95% in non-smokers. In return it stands on its own and leaves the other teeth alone, with roughly 95% still working at ten years. Where the surgical side calls for a specialist, we arrange that referral.
A fixed bridge
A false tooth anchored to the teeth on either side — fixed and solid, but it usually means reshaping those neighbours, which are trimmed down and capped with crowns that carry the replacement between them. The cost is permanent: healthy tooth structure is removed, and if decay ever creeps under a crown the whole bridge is affected. The track record is good — around 85% of conventional three-unit bridges are still in service at ten years.
Its more conservative cousin is the resin-bonded (or Maryland) bridge: the false tooth is held by a thin metal or ceramic wing glued to the back of one neighbour, with little or no drilling. It is kinder to that tooth, works well for a single missing front tooth, and is a common way to hold a space — say, in a younger patient waiting until they are old enough for an implant. The honest limit is that it can come unstuck: around 85% are still in place at five years, and counting a re-glue as a failure, only about 60% reach ten years — so I treat it as a strong medium-term answer, not a permanent one.
A removable partial denture
A removable plate carrying one or more false teeth that clips onto your remaining teeth; you take it out to clean and at night. It is the most adaptable option — one plate can replace several teeth at once, including gaps with no tooth behind them, and needs no surgery or heavy drilling. For larger gaps, or when the neighbours aren’t strong enough to carry a bridge, it is often the most sensible route. The trade-offs: it covers more of your gums and the roof of your mouth, takes getting used to, and because it traps plaque against your natural teeth it raises the risk of decay and gum problems unless your cleaning is thorough. It also needs occasional adjusting, refitting (a “reline”) or remaking as the ridge slowly changes shape. Our guide to dentures and partial dentures covers living with one in more detail.
Leaving the gap
Leaving a gap open is not the same as ignoring it. At each check-up we look that the neighbours haven’t tipped and the opposing tooth hasn’t moved into the space, with an occasional X-ray to check the bone underneath — so if anything shifts, we usually catch it early, while more options are still open.
How we choose together
There is no single correct answer, and the simplest plan that meets your needs is usually the right one. The questions I work through:
- Where is the gap, and does it show? A missing front tooth points toward replacing it for appearance and speech; a lone back molar may be a candidate for leaving the gap.
- What shape are the neighbours in? Already crowned or heavily filled, and using them to carry a bridge costs little extra. Healthy and unfilled, and an implant that leaves them untouched is more attractive.
- How much healthy bone is there, and do you smoke? Both strongly affect whether an implant is straightforward, needs a graft first, or is better avoided.
- How many teeth are missing, and is there a tooth behind the gap? Larger gaps, and gaps with nothing behind them, often point toward a partial denture or implants over a bridge.
- What can you commit to? Every option asks for daily cleaning and regular check-ups; implants and bridges ask more upfront, dentures ask for ongoing upkeep.
No single one settles it — reading them together is what points to a plan, and that part we do in the chair. I will always lay out the realistic choices, including doing nothing, and let you decide with full information. If cost is the barrier, it is worth checking your coverage: for eligible patients, the Canadian Dental Care Plan helps toward several of these treatments, and our team can sort the paperwork with you.
Getting started
Whether the tooth came out last week or years ago, book an examination: we will assess the gap and map the options that fit your mouth, with any X-rays we need. Reach our Barrie practice at 705-721-9229 or through our contact page, and we will find a time that works for you.
This guide is part of our Adult Patient Information library, alongside our other patient guides.
