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My name is***** and I can help you today. One more question- when your dog had his teeth cleaned, did they also take dental x-rays? This would have been very helpful to determine if one of his teeth is abscessed or not.
Based on your description, I think a dental abscess, nasal tumor or nasal foreign body is the primary possible causes of his symptoms. How does he do with antibiotics? Does the discharge resolve?
For diagnostics, dental x-rays are imperative, sinus x-rays could helpful and an MRI of his head would be the gold standard.
A less expensive diagnostic test would be cytology of the nasal discharge to look to see if it is pus vs tumor cells.
Does this help? What questions do you have?