The fundamental difference
An implant replaces the missing tooth root directly, standing on its own in the jawbone. A bridge replaces only the visible tooth, relying on the teeth next to the gap for support. That structural difference drives most of the practical trade-offs between them.
Why a bridge is often faster and cheaper
A bridge doesn't require surgery or a healing period for bone integration, so it's typically completed within a single visit. This makes it appealing when time or budget is a real constraint, or when a patient wants to avoid surgery altogether.
Why an implant is often the stronger long-term choice
Because an implant doesn't rely on neighbouring teeth, it doesn't require any preparation of otherwise healthy teeth on either side of the gap. It also stimulates the jawbone in the way a natural tooth root does, which a bridge can't replicate.
The deciding factor: condition of the neighbouring teeth
If the teeth next to the gap already need crowns — because of an old filling, decay, or previous damage — a bridge is efficient, since it treats those teeth and fills the gap in one process. If those teeth are perfectly healthy, many dentists will be reluctant to prepare them for a bridge purely to fill a gap that an implant could handle without touching them at all.
A fair question to ask
If a clinic recommends a bridge over an implant, it's reasonable to ask why — specifically, whether it's because your neighbouring teeth already need crowns, or purely for cost or speed. Both are valid reasons, but you deserve to know which one applies to you.