I cannot touch my lips when I try Tongue-on-lips (TOL) What can I do?

It is very well possible that your teeth are too close together, so your tongue does not get through. In that case you should open your mouth more (make the gap between your teeth bigger). . Another possibility is that your top lip is hidden in front of your teeth, or that you pull up your top lip when you ascend.One of the reasons you do TOL is to bring down the top lip, and to free it from being squashed between mpc and teeth. By doing TOL this is mostly an unconscious thing if you just try to hit your top lip squarely.