Best dental clinic in 200 feet radial road. Are there any areas more susceptible to decay than other areas? Areas where the brush cannot reach properly like in between the teeth, or areas such as the biting surfaces and deep grooves on the back teeth are more susceptible to decay or dental caries. To clean areas in between the teeth, flossing should be done regularly. Areas with deep grooves are often covered with sealants to protect them from caries.