Sialadenitis occurs when the salivary glands become infected, leading to inflammation and swelling. Bacterial or viral infections can cause this inflammation, but the former is most likely. The Staphylococcus aureus bacterium is the most common cause of sialadenitis; mumps is a possible viral trigger. Poor dental hygiene can also cause sialadenitis -- bacteria are more likely to build up inside the mouth and lead to infection.
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