If your gums are naturally unhealthy, isn't an implant meaningless...

What is the lifespan of an implant? Is there a set time for replacement, or can it be used permanently once placed?

According to numerous long-term studies, the success rate over 10 years is known to be over 90%. While it varies depending on the individual patient, precise implant procedures, oral hygiene management, and regular check-ups greatly contribute to the long-term maintenance of implants.
 
People who have received implants should take good care of them so they can be used for a lifetime.

Implants do not develop cavities, but like natural teeth, they can become inflamed due to periodontal disease (gum disease), and in severe cases, the implant may become loose. Therefore, individuals who have received implants need to visit regularly for maintenance, such as gum treatment.

My parents have weak gums or teeth.

You mentioned that you are consistently receiving gum treatment along with your implants.

But you also have frequent inflammation and are suffering from gum ulcers.

Having trouble because the implant isn't securely fixed, causing some difficulty ㅠㅜ

Even if I change dentists, I see the same thing, so I also have weak gums and I am worried.