A dental or pre-dental fricative is articulated with the tip of the tongue against the edge of the upper teeth. Science of Tone Production - Page 104 by Georges Antoine Brouillet - 1914 - 135 pages Full view - About this book
...(sie-rra). . S as s in set: mesa (me-sa), siento (sien-to). Т resembles English t, but is produced with the tip of the tongue against the edge of the upper teeth: toro (to-ro), mantener (man-te-ner). V is identical in sound with Spanish b, namely, it is a bilabial...
A dental or pre-dental fricative is articulated with the tip of the tongue against the edge of the upper teeth. 