Oh I meant it's normally a full dose once a day - I assume your dose is split over twice a day - ie so he gets it more often. But then 0.02ml once a day doesn't sound too off either. The vet may have decided the infection needs hitting hard and it needs a full dose twice a day. I suspect that's the case because tooth abscesses for humans are like this and need hitting hard as the infection can be trapped between a tooth root and the jaw. So if your vet has said twice a day at that dose then maybe you'd best just try and get that down him.
If you can find something he really likes and doesn't notice the meds in then I'm sure he'd eat it twice a day! Beef was the only thing that did it here! I think someone had some success dropping the meds on a bit of prawn cracker as well. Haven't tried that.