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Pit and fissure cavities are areas of decay on your molars, which are the larger teeth towards the back of your mouth. This type of cavity forms in the narrow grooves on the biting surfaces of these teeth. Because of the way these teeth are shaped, it is often difficult to clean their narrow grooves thoroughly; bacteria often collect in these areas. This type of cavity often worsens quickly and therefore should be treated as soon as it is discovered.
AMDENT ADMIN3, Administrator, answered
One of the most common spots for cavities is on the chewing surfaces of your back teeth (the premolars and molars). If you run your tongue along these chewing surfaces, you will feel rough grooves, which are called pits and fissures.
Because pits and fissures are more difficult to keep clean, they can be prime areas for cavities. Because of this, your dentist may recommend protecting them with dental sealants, a special plastic coating that covers and seals the chewing surfaces. New research shows that dental sealants not only protect healthy teeth from decay, but they also can stop decay in its earliest stages, sealing in the bacteria and preventing a cavity that otherwise would require a filling.