Dentals Cross-linguistically
For many languages, such as Albanian, Irish or Russian, velarization is generally associated with more dental articulations of coronal consonants so that velarized consonants (such as Albanian /ɫ/) tend to be dental or denti-alveolar while non-velarized consonants tend to be retracted to an alveolar position.
Sanskrit, Hindi and all other Indic languages have an entire set of dental stops which occur phonemically as voiced and voiceless, and with or without aspiration. The nasal /n/ also exists in these languages, but is quite alveolar and apical in articulation. To the Indian speaker, the alveolar /t/ and /d/ of English sound more like the corresponding retroflex consonants of his own language than like the dentals.
Spanish /t/ and /d/ are laminal denti-alveolar while /l/ and /n/ are prototypically alveolar but assimilate to the place of articulation of a following consonant. Likewise, Italian /t/, /d/, /t͡s/, /d͡z/ are denti-alveolar (, and respectively) and /l/ and /n/ become denti-alveolar before a following dental consonant.
Although denti-alveolar consonants are often described as dental, it is the rear-most point of contact that is most relevant, for this is what defines the maximum acoustic space of resonance and will give a consonant its characteristic sound. In the case of French, the rear-most contact is alveolar or sometimes slightly pre-alveolar.
Read more about this topic: Dental Consonant