Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain yes, pain in your teeth is related to your Sinus infection or sinusitis as there is a major group of sinuses present in close approximation with your upper teeth known as Maxillary sinuses and one each is present on either side of the nose.. Infection in sinuses can cause pain in the entire effected side of face/cheeks and can also cause pain in upper teeth which at times is misunderstood to be dental problem.. So my suggestion is to continue taking antibiotics, and along with it you should also take anti inflammatory painkiller like Ibuprofen, do warm saline gargles, do steam inhalations, do saline nasal irrigation, take decongestant nasal sprays like Xylometazoline spray and use a cool mist humidifier in your room.. You can also do warm compresses around nostrils over the cheeks.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.