Sometimes tooth discomfort settles if the cause is temporary irritation. However, pain from a cavity, crack, or infection usually needs professional attention. Even if the ache disappears, the underlying problem may still be present. A dental examination can help determine whether treatment is necessary. 

 Pain during chewing can happen when a tooth has a small crack, a damaged filling, or inflammation around its root. You might feel fine until pressure reaches the affected area. Avoid chewing hard foods on that side and arrange an examination to identify the cause. 

 Yes. Pain from an infected or inflamed tooth can sometimes spread toward your jaw, ear, or nearby teeth. This happens because nerves in these areas share pain pathways. If you also notice facial swelling, fever, or a bad taste in your mouth, seek prompt dental care. 

 Try rinsing gently with warm salt water and carefully flossing around the sore tooth to remove trapped food. Avoid very hot, cold, or sugary foods if they trigger pain. An over-the-counter pain reliever may help when taken according to its directions, but it won't treat the cause.