What is your absolute no. 1 tweakment for barcode lip lines?

This is a tricky one, because there is no one-size-fits-all tweakment, sadly. I would suggest having a read of my factsheet all about barcode lip lines, which you can find on the associated tweakments page here. Recently, I have seen good results from both Belotero Revive (which is a type of injectable moisturiser) and the Halo laser. The deeper your practitioner is prepared to go with a laser like this, the better the improvements that you can see, but there’s a period of downtime and recovery afterwards.