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What Causes Tooth Decay?  There are plenty of bacteria in the mouth, some are helpful to us, and others cause harm. These harmful bacteria are responsible for the decay of teeth. The bacteria together form a film (plaque) and participate in making acid from the food that you eat, mainly from sugars and starch. This acid formed damages the teeth, which we see as decay. As part of a natural process, our teeth keep losing and regaining minerals. If we do not care for our teeth properly, it results in the loss of more minerals than we can regain, thus leading to tooth decay Symptoms of Tooth Decay:  There are a few signs that you should look out for if you think that you have tooth decay. The symptoms of tooth decay are:  Stains on the surface of the teeth. They may be white or brown coloured.  You might see a cavity in your tooth.  You might feel sensitivity when you eat something sweet, cold or hot.  Pain in the tooth (known as toothache)  Sometimes, you may have a fever along with swell