So your tooth is aching. It’s keeping you up at night. You wish you’d better appreciated life before the toothache. You want the pain to go away. You’re in distress. Why is it aching? You check the common causes of toothache online. The common causes of a toothache are as follows, you find:
• Bruxism (i.e. grinding teeth at night).
• Tooth decay.
• Gingival recession.
• Gum disease.
• Abscess.

The thing is, you’ve just been to the dentist, and the dentist said that your teeth were in good shape. So why, you ask, are your teeth hurting? Well, maybe it’s sinus pressure.
Sinus pressure causing toothache
Sinuses are areas to the side of your nose and above your eyebrows that fill up with air. The linings of the sinus sometimes become swollen/inflamed, which is called sinusitis. As it turns out, pain in the face is a main symptom of sinusitis. Your maxillary sinus, situated in the space behind your cheekbones, might be causing you pain, and this pain might be occurring relatively close to the roots of your upper molar teeth. Fluids sometimes build up in this area and push again the roots of your upper molar teeth. When this happens, it’s very easy to mistake sinus pain for your teeth hurting. In fact, your brain will probably send you messages telling you that your teeth are hurting. This is not actually toothache: this is sinus pain. The incidence of feeling pain in an area other than the part of the body where the issue is originating from is known as referred pain.

How To Tell If It’s Sinusitis And Not Toothache
Sinusitis will be accompanied with a wide range of symptoms. These include:
• A headache.
• A sore throat.
• A sensitive face.
• Clogged nasal passageways.
• Nasal discharge (i.e. cloudy mucus).
• Fever.
• Earache.

If you’re manifesting any of these symptoms, as well as your teeth seeming to ache, then it is possible that your pain is sinus-related. If it is spring season, moreover, and you’re in the habit of getting hay fever, the possibility that the tooth pain is cause by sinus problems is greater still.
How to treat Sinusitis
So you think you might have sinusitis instead of toothache. Now you’re wondering how to actually get rid of the sinusitis. Over-the-counter anti-inflammatory medications such as ibuprofen can help in reducing the inflammation of the lining of the sinuses. Some people find comfort in holding a warm compress their your face in order to relieve the discomfort from sinusitis.
If the pain around your teeth subsides after taking these measures, then you’ll know that you’ve had sinus problems and not tooth problems. If the pain remains, however, then either the sinusitis is still ongoing, or the issue may indeed be with the teeth themselves.
In any event, regardless of whether the issues affecting your teeth are sinus-related or due to the teeth themselves, it is always advisable to go back to your dentist to have a thorough evaluation in order to address the problem and to return to full health.