Can a score of 0 where I feel no pain at all be achieved after taking painkillers?

Basically, no matter what kind of surgery, there will be some degree of wounding, and there will still be some pain. It may become more painful during rehabilitation and the activity of getting out of bed will further pull on the wound.

Although there is no way to achieve a score of 0 (no pain at all), a score of 3 or less is clinically referred to as mild pain, i.e.,"tolerable pain"

Mild pain will not cause any inconvenience to mobility or seriously affect sleep or one’s quality of life.Therefore, through various analgesic methods, the goal is to keep the pain score under 3, which is considered to have achieved good pain control.