A USA Model 7" tooth forceps is a dental extraction instrument used for removing upper premolar teeth. The "USA Model" refers to a standard style of handle, while the number "7" specifies its use for upper premolars. 

Extracting upper premolars:

This is the primary function of the 7" forceps. The shape and design of the beaks are specifically contoured to fit the anatomy of the upper first and second premolars.

Minimizing trauma:

The forceps' design is engineered to provide a secure and precise grip on the tooth, which helps to reduce the risk of slippage. This allows for a quicker, less painful extraction for the patient with minimal trauma to the surrounding tissues and bone.

Applying controlled leverage:

The angle of the instrument helps a dentist direct force along the tooth's long axis, which is necessary for effective and safe extraction.