4 year.old.needa a filling

Please no judging! Ive already seen mums worry about this however my LO chipped a tooth which has how discoloured. The dentist at first didnt say anything until i questioned it and then she said oh we can do a filling. Its up to me. She said the filling will be some drilling and then fikled. Apprently doesnt hurt? No needles nothing - im.worried?