Extraction solely to relieve crowding without subsequent orthodontic treatment can lead to malalignment of teeth and improper occlusal relationships. This uncoordinated spacing affects the articulation of sounds, particularly sibilants and labiodentals, resulting in disturbed speech. Without orthodontic guidance, the teeth do not properly reposition, causing gaps or misfits that impair tongue placement and airflow during speech. Therefore, extraction alone disrupts the oral environment necessary for clear phonetics.
Reference: Shafer’s Textbook of Oral Pathology, 7th Edition.