How long will the dental implant bridge last?

If your current bridge is working for you and you are happy with it, it could last a very long time. If any of the supporting teeth get decay, then it may need to be replaced. Having said that, with proper care, decay may never set in and it could last indefinately. As time goes on, changes with the gums and bone around the bridge may lead to replacement, but these changes usually take many years.
If you were replacing it and placing implants to support a bridge, you could expect that to last a long time as well, as implants do not decay. The forces of the bite need to be managed and esthetics are involved, but a well made implant supported bridge should last a very long time.

It sounds like what you're describing is a tooth-borne bridge (not an implant-supported bridge). If that's the case, a tooth-supported bridge can last 10 years (or more) depending on a variety of factors (for example, your hygiene, your habits, if you take regular visits to the dentist, if you're more prone to decay). Hope this helps!

A dental bridge is used to replace one or more missing teeth and it is cemented in place. It can either be attached to natural teeth or dental implants. In either case, how long it lasts will depend upon several factors.The quality of the homecare as well as professional care is probably most important, followed by the initial health of the bone around the teeth or dental implants that are supporting the bridge.If dental implants are supporting the bridge, then cavities will never be a concern. If, however, teeth are supporting the bridge then The person's natural risk for cavities needs to be taken into consideration. Another very important factor is the design of the bridge and how much force each support tooth for implant is expected to withstand.Taking everything into account, a properly designed and well maintained bridge