My sinus problem never persist even after my nasal opetation. I have to rely on oral medication for certain time. What is the best cure?

It depends. From what i gather, you still have sinus problems after sinus surgery. Very broadly, persistent allergies, smoking, possible need for revision surgery, problems with the immune system, ongoing exposure to germs (e.g. Kindergarten teachers), and a tendency for sinus polyps to regrow are possibilities. Rarely is surgery a total "cure, " so it is important to follow up or maybe get a second opinion.