Dentist: Don’t be scared. It will not hurt or pain you.
I will remove your teeth gently in one second.
Patient: Ah! It is paining…
Dentist: I haven’t yet removed…
Patient: You are stamping on my foot.

Please correct if there are errors.

Dentist: Don’t worry, this won’t hurt a bit.
Patient: Ah! It’s hurting!
Dentist: But I haven’t started yet.
Patient: You’re treading on my foot!

Again, I tried to make it snappier.