Hello, Your tooth discomfort may very well be related to your sinusitis. This is not uncommon. Please be careful before introducing more antibiotics. You may need a change in the antibiotic or a stronger dose, if what you have taken has not been fully effective. Please consult your doctor before taking any antibiotics. Definitely take medication to reduce discomfort due to congestion. This will help determine if you have an issue with the tooth or it is merely a reaction to the inflammation caused by the congestion. Inflammation and the accompanying discomfort needs time to heal. Keep this in mind and try and reduce your discomfort while giving more time to heal. My suggestions are to use a toothpaste for sensitive teeth, fluoride rinses, maintain good day dental care, follow a bland diet with no acidic and spicy foods. Your mouth may be acidic and this can cause a sensitive reaction at the gum line. This can be severe if you have root exposure or recession. You may also be breathing through your mouth with the congestion. This creates a harsh environment and dries out your tissue. Your plaque is much harder to remove. Please make sure you are well hydrated. Use of antibiotics can also cause a reaction such as an oral yeast infection. Taking acidophilus may prevent this. Other possible dental conditions may relate to grinding your teeth or a possible tooth with a fracture. You may continue to monitor the area and take an additional x-ray if your condition continues to rule out an abscess or other conditions. Thank you for your inquiry. I hope you find my suggestion is usable and that you feel better soon.