Can this composite filling be added to or "topped up"? Seems to have shrunk

[ToothPatient]

The filling has obviously shrunk with time (got it in 2019).

As you can see on the front portion, I recently had that filled also.

Curious how much longer that tooth could last, as I've read composite filling typically have a lifespan of 5 to 7 years.

The dentist seemed to get rid of so much tooth putting the filling in also, as when I compare to the other side:

There's obvious much more tooth there.

In any case, can that filling be "topped up" by adding more composite, without further drilling and traumatizing the nerve?

This is an x-ray of the first/filled tooth, before I had that frontal cavity filled a few days ago.

 

[Dr M]

The filling can be topped up. If there is any additional decay, the decay would need to be cleaned out first.