Dental cavities are caused when bacteria gets trapped in nicks and holes in teeth and eat away at the dentin and enamel. Teeth should be brushed at least twice a day using a soft brush. Sugar helps the bacteria that decay teeth to grow as do refined carbohydrates. Soda is a number one cavity causing drink loaded with sugar and additives that eat away at enamel. Oil pulling is a great way to rid your teeth of plaque and should be done once a day before brushing.