Hi welcome to HCMForum. He had dental procedure and after that he got fever
and upper abdominal pain
. it is enough to visit a doctor, he had infection resulting in fever he got upper abdominal pain due to gastric irritation of the tablets he is using and indigestion
due to fever. as he is under treatment of a dentist
you can seek his advise , he will be fine by changing the antibiotic and using the PPI under the supervision of a doctor. if the dentist refers to other doctor you can consult a surgeon. to get relief from gastric pain i advise some diet restrictions as avoid taking spices chillies junk foods and oily foods. thanks for calling.