Orthodontic alignment is traditionally viewed as a means to improve aesthetics and function, yet its role as a modifiable determinant of periodontal risk remains underexplored in interdisciplinary theory. This conceptual manuscript proposes that tooth position directly modulates plaque retention patterns, which in turn govern periodontal tissue stability and long-term disease susceptibility. Through a synthesis of contemporary evidence, the authors construct an interdependent triad: malalignment creates sheltered niches for microbial accumulation; orthodontic correction disrupts these niches and redistributes biofilm; and the resulting tissue response either reinforces or erodes periodontal attachment. Four core propositions are advanced to explain these interactions. First, crowding and rotation increase interproximal and gingival plaque retention surfaces beyond the threshold for effective self-care. Second, alignment reduces these surfaces while simultaneously improving access for professional instrumentation. Third, the modified plaque ecology attenuates inflammatory cascades that drive attachment loss. Fourth, sustained alignment stabilizes periodontal architecture by minimising secondary occlusal trauma and facilitating physiologic bone remodelling. The model positions orthodontic alignment not as an adjunct but as an active modifier capable of lowering periodontal risk in both healthy and compromised dentitions. Clinical translation emphasises early risk stratification and sequenced ortho-perio care to harness alignment-induced stability. This theoretical framework reframes orthodontic intervention as a periodontal preventive strategy and calls for future interdisciplinary protocols that quantify alignment-specific risk reduction.
