My all-on-4 bridge is loose. How long can I wait before it causes damage to one or all implants?

There is now a better alternative to screws.   The same company that makes the Snap in Denture attatchments for removable snap in dentures now has created a screw free alternative that only can be removed by dentist.  It is a cleaner and easier to manage fixed denture with no screws or screw holes makeing in ideal .  It can be easily removes by hydraulics in the dental office.Personally, I prefer the snap in denture thart is far easier to clean but  the same company is now making a fixed snap.Good news for all on four or six denture patients.Is all on four a good idea?  If one implant fails the case fails, additional implants decrease risk but increase cost and complexity.This new F-Tx system reduces complexity.Ira L Shapira DDS, D,ABDSM, D,AAPM, FICCMOChair, Alliance of TMD OrganizationsDiplomat, American Academy of Pain ManagementDiplomat, American Board of Dental Sleep MedicineRegent & Fellow, International College of CranioMandibular OrthopedicsBoard Eligible, American Academy of CranioFacial PainDental Section Editor, Sleep & Health Journal
Member, American Equilibration SocietyMember, Academy of Applied Myofunctional Sciences

The strongest muscle based on its weight is the masseter. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars. 
It is possible that a screw has worked itself loose, you should have it checked ASAP

The best approach would be to get in to see your dentist as soon as possible. Failure can happen at any time and the longer you leave it the more chances you have of expensive damage. It's very possible that a quick appointment could solve the problem with the loose bridge. 

If an implant is going to fail, it fails usually within the first year that it is in your jaw. Unless something has dramatically changed with your health, it is not likely to fail "all of a sudden" after 3 years. 
The most likely situation is that some part of your appliance is loose. There are many screws in the All-on-4 treatment and they can loosen over time and cause things to move. You should see your dentist ASAP if any part of your All-on-4 is moving. 
A loose screw means that your prosthesis may be moving around and applying pressure unevenly at different implant sites. One of the most important factors to maintaining healthy implants for a long time is to have a well distributed biting pressure at each implant site. A loose prosthesis does not allow this pressure to be distributed well. 
This is why it is important to go to regular check ups for your All-on-4 prosthesis. By following a good check up schedule, any loose screws or any other little thing that is out of the ordinary can be adjusted before it becomes a problem. 

This is quite common with all on 4. You need to see your surgeon right away to ensure nothing serious happened to your bridge. Your bite could be off, an implant could have failed, a screw joining the bridge and implants could be loose or the bridge itself may have cracked.