Pronounciation of D

Is there a dental D in Portuguese or all pronounced with the tongue behind the teeth softly

We can pronounce D as a simple hard D, which would be the standard pronunciation. But you’ll find a number of people with a “TH” sound to their D. From what I could gather not so long ago, linguists have acknowledged both of these variations of the D in European Portuguese (harder D and the “Th” hybrid, more plosive vs. more fricative), but the “Th” hybrid is considered more prevalent in central and southern Portugal rather than up north (which makes some see it as just a regional variation). Also, linguists seem to only validate it between vowels, even though you might sometimes hear it in other spots.