Dental Hygienist Questions Cavities

How is tooth decay caused?

I'm just curious about how exactly tooth decay is caused. I've had a few cavities in my lifetime, and all of them taken care of without issues after. But what causes them to develop in the first place?

3 Answers

Tooth decay is a multi factorial disease. Primarily it is caused by toxins and acids released by bacteria found in plaque that attack the tooth structure and break it down. Sugar feeds these bacteria. Brushing lessens the bacterial count in the mouth. However, other factors such as mineral content of the teeth, the ability of the saliva and its chemical composition can influence the likelihood of the development of decay. This may vary from person to person. Having said that, brushing, oral hygiene, and being aware of sugar intake, as well as fluoride use can help minimize the chances of decay.
Diet, genetics, oral hygiene, meds, general health, bite, etc...
Tooth decay is caused by plaque and bacteria accumulating in areas of your mouth that you are not keeping cleaned. The bacteria secrete acidic content that softens your teeth and allows the bacteria to proliferate in this area. Once the softened area is through the enamel, the bacteria travel through the inner tooth structure through something called dentinal tubules. This is how cavities are formed.