Poor Oral Hygiene:
Not brushing your teeth regularly allows plaque to build up and attack the tooth enamel.
Plaque is caused when bacteria, acid, food particles, and saliva all combine in your mouth. This plaque adheres to your teeth and builds up over time. The acid in the plaque attacks the enamel of your tooth and eventually can cause holes in your teeth, otherwise known as cavities.
Saliva helps wash plaque from the teeth. If you have a dry mouth with a very little saliva, plaque may build up more quickly
Eating and Drinking:
This is where it all begins. Since we all must eat and drink to live, there’s no way to avoid this, but it does play a significant role in the formation of cavities. When you eat or drink, carbohydrates remain on your teeth until you brush. Even after brushing, you may not be able to remove all food particles or carbohydrates from your teeth. Foods that tend to cling to your teeth can increase your risk for a tooth cavity. Be sure to brush your teeth regularly, especially after drinking milk or soda, or after eating dried fruit, dry cereal, hard candy, caramel, taffy, raisins, sugary cereals, cookies, and breath mints.
Bacteria and Acid:
While most people don’t like to think about it, bacteria naturally live in your mouth. When these bacteria digest the carbohydrates that linger on your teeth and in your mouth, acid forms.
can contribute to a tooth cavity by causing acid from your stomach to flow back into your mouth. Similarly, bulimia increases the risk of a tooth cavity when the teeth are exposed to stomach acid during frequent vomiting. In addition, some types of cancer treatment that expose the head and neck to radiation can promote a tooth cavity by changing the makeup of the saliva to promote increased bacterial growth.