Common symptoms include nasal congestion with a watery discharge in an acute episode and thick yellow or green discharge in the more chronic state, facial pain or pressure sometimes including what may feel like dental pain, fever, headache and coughing due to post nasal drip. Interestingly, dental infections, especially of the upper teeth, may present with sinusitis-like pain because of the proximity of their roots to the sinus floor, and in some cases there may actually be an infection of the sinus originating in the teeth, the more severe form of which is when the sinus floor is perforated by an expanding dental abscess. As you can imagine this scenario would present the sinus with a large bacterial load and may readily, in the warm, moist environment of the sinus, create rampant infection.
Speaking of warm, moist environs, there is another, more insidious form of sinusitis that used to occur mostly in immune-compromised people (such as those with AIDS or Diabetes) but is manifesting more and more in seemingly healthy individuals: fungal sinusitis. There is a possible connection between the use of antibiotics in the treatment of dental and sinus bacterial infections and the proliferation of opportunistic fungi in susceptible body cavities.
A bout of sinusitis usually last for 7-14 days and should completely resolve once the bacterial load is cleared via nasal discharge. If you are experiencing recurrent bouts or long standing sinusitis, require repeated courses of antibiotics, if there is sinus or tooth pain, especially when biting down, a feeling of fluid moving in the sinus when changing from lying to sitting, or if you have a dental abscess or non-vital tooth that has been there for a while, it may serve you to have your dentist investigate potential triggers for sinusitis in the mouth.
Mehra, P.; Jeong, D – Maxillary Sinusitis of Odontogenic Origin. Current Allergy and Asthma Reports, May 2009 9(3): 238-43
Ramadan, H.H. MD MSc – Sinusitis, Fungal. E-Medicine, Aprill 2009
J Hajiioannou, E Koudounarakis, K Alexopoulos, A Kotsani and D E Kyrmizakis - Maxillary sinusitis of dental origin due to oroantral fistula, treated by endoscopic sinus surgery and primary fistula closure. Journal of Laryngology and Otology, May 2010.