When I first learned, I did ALL my tonguing between the teeth, onto the lips. I've seen this described as 'English tonguing' someplace or other.
It gave me a very clean attack and release. But, ironically, I think it helped keep me from developing my high range. Keeping my teeth so far apart made for a very spacious mouth. Good for a big tone, but limiting my ability to use the tongue arch to slur or play high.