Which of the following is NOT an advantage of flexible (thermoplastic) complete dentures compared to conventional acrylic (PMMA) complete dentures?

Flexible dentures are made from thermoplastic materials (e.g., nylon-based materials such as Valplast). While they offer advantages including comfort, biocompatibility, no metal clasps, and aesthetic benefits, they are NOT stronger under heavy occlusal forces. They have lower flexural strength, lower fracture resistance under heavy biting, and inferior retention of acrylic teeth compared to conventional PMMA dentures. They may also be more difficult to adjust and cannot be easily relined. Conventional PMMA dentures remain superior in strength, reparability, and long-term durability.