Missing a tooth: implant, bridge, or leave it?

Losing a back tooth rarely feels urgent. It doesn't show, chewing adapts within a few weeks, and the decision is easy to postpone. That's precisely why so many people end up choosing between more expensive options a few years later than they needed to.

What actually happens to a gap over time

Teeth are held in position by their neighbours and by the tooth they bite against. Remove one and that balance goes:

• Neighbouring teeth tilt into the space, usually over months to a few years. Tilted teeth are harder to clean and trap food.
• The opposing tooth over-erupts, drifting down or up into the empty space because nothing meets it.
• The jawbone under the gap shrinks. Bone is maintained by the forces a tooth root transmits into it. With no root, the body reabsorbs it.
• The bite shifts, sometimes producing jaw joint discomfort years later that nobody connects to the extraction.

The bone loss point is the one that matters financially. It's also the one that makes waiting expensive: an implant placed soon after extraction is often straightforward, while the same implant several years later may need a bone graft first.

Option 1: the implant

A titanium post is placed into the jawbone in place of the root, left to integrate with the bone over a few months, and then a crown is fitted onto it. It's the only option that replaces the root rather than just the visible tooth.

Why people choose it: neighbouring teeth are untouched, the bone is preserved because the post transmits chewing forces into it, it's cleaned like a normal tooth, and a well-placed implant in a healthy mouth can last decades.

The genuine drawbacks: it costs the most upfront, it involves minor surgery, and the process takes several months because bone integration cannot be rushed. It also needs enough healthy bone to begin with, which is a question of timing.

Option 2: the bridge

The teeth either side of the gap are prepared, meaning a layer of healthy enamel is ground away, and a three-unit unit is cemented across: crowns on both neighbours with a false tooth suspended between them.

Why people choose it: it's typically finished in two or three appointments over a couple of weeks, it costs less upfront, and it needs no surgery. If the neighbouring teeth already have large fillings or need crowns anyway, a bridge can be a genuinely elegant solution because those teeth were going to be crowned regardless.

The genuine drawbacks: two healthy teeth are permanently altered to fix a problem they didn't have. The bone under the gap still shrinks, because there's no root. And bridges have a finite life, commonly around a decade or so depending on how they're cared for. When one fails, the supporting teeth have already lost enamel, so the next option is usually a bigger one.

Option 3: leaving it

There is one situation where this is genuinely reasonable: a missing rearmost molar, particularly a wisdom tooth or the tooth in front of it, where there is no tooth behind it to tilt and the effect on chewing is minimal. Plenty of people function perfectly well without a second molar and never need to replace it.

Outside that, leaving a gap is a decision to pay later rather than a decision to save. The bone shrinks, the neighbours move, and the treatment that would have worked this year becomes a longer and more expensive treatment in five.

Cost, viewed properly

Comparing today's prices makes the bridge look obviously cheaper. Comparing over twenty years often reverses it, because a bridge is likely to be replaced at least once in that period and each replacement is a fresh cost on teeth that have less structure left.

That doesn't make the implant automatically right. A larger upfront cost is a real constraint, and a bridge that solves the problem now is better than an implant you keep postponing. It just means the comparison should be made across the whole period rather than at the counter.

What actually decides it

• Are the neighbouring teeth healthy and untouched? If yes, that argues for an implant. If they already need crowns, a bridge becomes much more attractive.
• How much bone is there? This is why timing matters and why an OPG X-ray is part of the assessment rather than an upsell.
• Do you smoke, and is any diabetes well controlled? Both affect implant healing significantly and need an honest conversation rather than an optimistic one.
• How long can you wait? An implant takes months. If there's a wedding in eight weeks, the sequencing matters.
• What's the budget, realistically? A well-made bridge you can afford beats an implant you defer for four years while the bone quietly disappears.

If you take one thing from this

Get the gap assessed early, even if you don't intend to treat it yet. The assessment tells you how much time you actually have before your options narrow, and that's information worth having whichever route you eventually take.