What instrument is primarily used to reflect, retract, and provide indirect vision during dental procedures?

The mouth mirror is an essential instrument in dental procedures used to reflect light onto the tooth surface, allowing the dentist to view parts of the oral cavity that are not easily visible. It also serves to retract the cheeks, tongue, or lips, creating a clear area for the dentist to work in without obstruction. This retraction is vital for maintaining a dry field and providing the necessary space to perform various procedures effectively. Indirect vision is another crucial function of the mouth mirror; it enables the dentist to see the surfaces of teeth and areas of the mouth that are otherwise hidden from direct sight.

The other instruments listed serve different functions. A dental explorer is primarily used to detect cavities or irregularities in the tooth's surface, a probe is used for measuring periodontal pockets and assessing gum health, and a scaler is utilized for the removal of calculus and plaque from tooth surfaces. Each instrument has its specific role, but it is the mouth mirror that is designed for the purposes of reflection, retraction, and providing indirect vision during dental procedures.