i have noticed two weeks ago, that my cat Jazz has a swollen bottom lip. i thought probably she got bitten as she chases all insects and flies

. a week later her lip was not better, so my partner took her to a vet. after examination vet decided it is a teeth problem, so she removed it and gave Jazz antibiotics and told to bring her back 3 days later for another antibiotics dose. Her lip is not better and i am very worried now. Vet told me to bring her back if is not better in three days, so she will cut her lip to see what's going on. i am so worried and not sure if i trust our vet now. it seems to me that she is not sure what she is doing. (I was happy with her service before)
did anybody has similar problems with their cats? I am worried that it might be a sign of more seriuos problem, such as heart, liver..
Please advise

(