Cavities are holes in the teeth caused by tooth decay. Tooth decay occurs when bacteria in the mouth produce acid which destroys the enamel and the layer beneath it.
•Cavities are caused by the buildup of plaque on the teeth, usually due to poor oral hygiene.
•Tooth decay damages the enamel before reaching the dentin. Once the dentin is affected, a cavity starts to form.
•A filling is usually required to seal the cavity.
Prevent cavities by brushing and flossing daily. Also, see the dentist regularly for checkups and cleaning to remove plaque.
Read more at:http://www.medicalnewstoday.com/articles/321259.php