The true way is to dismiss tongue consciousness, _let go_, and a normal flexibility will easily manifest itself.
THE LIPS The lips, equally with the tongue, are organs of articulation.

The upper lip is the principal factor of the two; the under lip seems to follow the lead of the upper.

The lips need much training, and it can readily be given them.

While practising to educate the lips, both lips should be projected forward and upward, at the same time pronouncing the word "too." Bring the edge of the upper lip as high toward the nose as possible in practice.

This will bring the corners of the mouth forward and lift the lips clear and free from the teeth, and thus add one more resonance cavity.