The material that makes up the composite filling is mixed then placed directly in the cavity, where it hardens. They last several years, although composite isn t recommended for large cavities, or areas where they may chip. The final type of filling is porcelain. Porcelain is very common, and produced in lab where it will be matched to your teeth then bonded to the affected tooth. If you ve had a tooth come out of place, you can normally reposition it with your fingers. You shouldn t use a lot of force, simply because it could damage the tooth. You shouldn t force the tooth into place, rather try and jiggle it around. You can also use moist tissue to hold the tooth in place, until you can get to a dentist. If you visit your dentist on a regular basis, he will check for cavities. Without visiting the dentist, it is impossible to tell whether or not you have a cavity. Most cavities develop below the gums, and you won t be able to see them. If the cavity exists in the tooth, you will be able to see it, as it will change the color of the affected area. Even though the pain may go away, the problem will still be there until you go to the dentist and get it treated. Although the dentist is the preferred way to go, you may have to wait on an appointment, or the toothache may occur on a weekend or a time when the dentist isn t available. Your best advice is to seek dental care ASAP, as the infection can always return at any given time. Food and debris will build up between your teeth, which makes dental flossing very important. The main problem many people have against flossing is the fact that it can result in bleeding of the gums. Anytime you floss and get between your teeth and around your gums, the floss will rub against your gums, resulting in bleeding. A crack in the tooth is also a cause, although it can be difficult to diagnose, as cracks will normally appear to be invisible to the naked eye and x-rays. Cracks can make your tooth feel as if it is exploding, as they expose the dentin and nerves to the air and anything else you put in your mouth. If you don t get them fixed, they will get worse, possibly leading to your tooth breaking off at the gums.