First, I just want to say I'm not a veterinarian so I'm not an expert on this topic.
That said, I've been topically treating a snake that has an abscess on her mouth with silver sulfiazine per the recommendation of my vet. The fact that he had no fear of literally putting the stuff on her mouth makes me believe it must be nontoxic (or at least very mild) and therefore I would not worry in your case.
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