My lips definitely don’t touch on F or V, my upper teeth just touch my lower lip but upper lip is safe from contact.

If your lips actually touch for f and v you’re saying them wrong lmao, it’s not “epp” and “bee” it’s “eff” and “vee.” As everyone else already said, your lips don’t touch, but your lower teeth should be touching your upper lip.

Tell us you have a speach impediment without telling us you have a speach impediment.

Ehh, V feels more like my bottom lip touching my teeth, not the lip

I’m sure accent and dialect (within English) matter a lot.

For F my lips come close but blow out before touching. For V they come close but it’s my top teeth that touch my lip.

W is because you say the name of the letter. If you were to produce the sound that the W is associated with, you won’t touch lips.

And I agree with the others, F and V are the lower lip meeting the upper teeth.

I mean, lips are touching with any letter already. So you just need to define the relative threshold from the origin of the lips to the center.

With B, P and M, the center of the lips touch. With F, V and W it’s just the sides. With other letters it is the origin.

I have no idea why I’m so into this.