Eye problem in cat
There is a possibility that the problem with the eye may be connected to the teeth. She may still need to go on an extended broad spectrum antibiotic, but would recommend that you take him for a recheck and tell your vet that he hasn't responded. A bacterial culture and sensitivity may need to be performed to help determine which antibiotic to use.
Was any blood work done - sometimes there is evidence of an underlying virus that cats may carry for a long time which may also be reducing his resistance.
Martin Slome DVM
Centre Street Animal Hospital
7700 Bathurst Street Units, 40-42
Tel. (905) 771-9855