Multiple phonetic and linguistic studies confirm that South Asian languages systematically maintain a phonemic contrast between dental and retroflex places of articulation across various consonant categories, including nasals.
The claim states that South Asian languages maintain a distinct phonemic contrast between dental nasal and retroflex lateral sounds (or dental-retroflex contrasts generally among nasals and other places of articulation). Papers [1], [2], and [4] explicitly discuss and provide empirical evidence for the phonemic contrasts between dental and retroflex places of articulation, specifically examining nasals and laterals in South Asian languages such as Kannada, Punjabi, and general Indo-Aryan and Dravidian language families. No papers refute the claim.