Hello and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. As per your complain sinusitis can occur due to infection in the sinuses and although you are taking antibiotics which is in moderate dose and can relieve bacterial infection only. In case if you had sinusitis it can be from a bad case of cold and flu or can also be related to infection originating from extraction site if the tooth extracted was an upper jaw back tooth as their roots lies in close contact with the sinus floor. I would suggest you to consult an otolaryngologist and get evaluated. A thorough clinical evaluation and investigations like PNS view x-ray or MRI scan can help in diagnosis and treatment can be done accordingly. You can be advised a course of higher antibiotics like Augmentin, anti-inflammatory painkiller like Ibuprofen, decongestants like Pseudoephadrine, do saline nasal irrigation, steam inhalation and use a humidifier in your room. You can also be advised decongestant nasal sprays containing Xylometazoline or Oxymetazoline. Avoid spicy and chilled foods. Do warm compresses around nostrils. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora