What damage can occur from using the prophy angle at a high speed?

Using the prophy angle at high speeds can generate significant frictional heat due to the rapid rotation. This heat is primarily produced between the prophy cup and the tooth surface, and if it reaches excessive levels, it can result in thermal damage to the surrounding soft tissues, specifically the gingiva. The high speed can also be detrimental as it may not allow for adequate cooling or lubrication of the area, further increasing the risk of burns to the gingival tissue.

Understanding this concept emphasizes the importance of maintaining controlled rotation speeds during prophylactic procedures to minimize the risk of thermal injury and ensure patient safety. Other options, while relevant in a dental context, do not pertain to the immediate mechanical effects of high-speed operation of the prophy angle.