For mandibular isolation, which teeth should remain exposed?

For mandibular isolation, the correct choice is to leave the area from cuspid to cuspid exposed. This approach allows for effective management of the saliva and moisture in that specific region, which is crucial during dental procedures, particularly when working in the anterior section of the mouth.

Leaving the cuspid to cuspid area exposed helps in maintaining clear access to the anterior teeth where significant reaction and patient interaction take place. It also allows for proper placement of isolation materials such as rubber dams or cotton rolls. This area represents a balance between isolating sufficient posterior structure necessary for certain treatments while still ensuring that the anterior teeth are accessible for procedures like restorations or endodontics that may require working on the incisors or cuspids.

Other choices involve either too few teeth or too many teeth which might not provide the ideal level of access and moisture control necessary for effective dental practice.