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Not brushing and flossing your teeth regularly and not seeing a dentist for checkups and cleanings.

Eating foods that are high in sugar and other carbohydrates, which feed the bacteria in your mouth.

Not getting enough fluoride. ...

Not having enough saliva.

Hope this may helps uu.......
When you consume food and drink high in carbohydrates- particularly sugar foods and drinks - the bacteria in plague turn the carbohydrates into energy they need ,producing acid at the same time

If the plague is allowed to build up,the acid can begin to break down the outer surface of your tooth and can eventually enter and damage the soft  part at the center of the tooth.