True dental consonants are relatively uncommon. In the Romance languagesn is often called dental. However, the rearmost contact (which is what gives a consonant its distinctive sound) is actually alveolar, or perhaps denti-alveolar; the fact that the front of the tongue touches the teeth may be more visible, but is unimportant acoustically. The difference between the Romance languages and English is not so much where the tongue contacts the roof of the mouth, as which part of the tongue makes the contact. In English it is the tip of the tongue (such sounds are termed apical), whereas in the Romance languages it is the flat of the tongue just above the tip (such sounds are called laminal).
However, there are languages with true apical (or less commonly laminal) dental n. It is found in Dravidian languages such as Tamil and Malayalam, and in the South-American Mapudungun. For example, in the Malayalam pronunciation of "N?r?yanan", the first "n" is dental (the second is retroflex and the third alveolar).