All of the following statements regarding Class III interproximal lesions are true except for one. Which is the exception?

In the context of Class III interproximal lesions, it is essential to understand how these lesions are managed in terms of cavity preparation and enamel conservation. Unsupported facial enamel should indeed be removed; leaving it could jeopardize the integrity of the restoration and increase the risk of future fractures, which is why the statement suggesting that unsupported facial enamel should remain is incorrect.

As for the other statements, caries in Class III lesions often occurs apically relative to the interproximal contact area because of plaque accumulation in that region. The lingual approach is preferred for cavity preparation of Class III lesions as it provides better access to the carious area while conserving facial enamel, which is crucial in aesthetic zones. Leaving unsupported facial enamel for internal bonding is not considered an acceptable practice; removing it ensures that the restoration has a stable foundation, enhancing both durability and aesthetics. This makes the understanding of enamel support critical in restorative dentistry.