All-on-4 treatment has two parts: the implants (or the tiny screws) and the Prosthesis (the appliance that replaces the lost teeth). As mentioned above, the implants can last a lifetime with proper oral care, but it’s not the case for Prosthesis. Usually, prothesis in all-on-4 will probably need replacements after 10 to 15 years, even with utmost dental care.
The Prosthesis attached to the dental implants are durable and stable, but then they are still prone to damage and wear over time. Patients should not worry about replacements since the implants won’t be affected during the prosthesis replacement.