Under clinical conditions, composite resins can suffer surface wear and degradation by coming in contact with oral fluids. What is true about this statement?

The statement regarding composite resins emphasizes the potential for wear and degradation when these materials interact with oral fluids. This is a true statement, as composite resins are known to be affected by various factors in the oral environment, including moisture, pH, and mechanical forces from chewing.

In terms of the first part of the statement being true, it acknowledges the reality that clinical conditions, such as bacterial activity and dietary acid exposure, can lead to the breakdown or wear of composite resins. Composite materials, which are typically used in dental restorations and aesthetic applications, can wear down due to abrasion from opposing teeth and can undergo chemical degradation due to interactions with oral fluids, which may contain acids and other substances.

For the second part to be considered false, it implies that there is no degradation or wear happening, which contradicts the knowledge established in dental materials science. Therefore, the accurate understanding is that composite resins are indeed susceptible to wear and degradation in the oral environment, affirming the truth of the first statement while discrediting any notion in the second statement that suggests otherwise. This is why the selection that reflects this understanding is the one stating the first statement is true while the second is false.