Hi, For laugh line or we nasolabial fold, it is due to deficiency of cheek fat and sagging skin.
I correct this deficiency by giving filler into the cheek area and into the triangular area called canine fossa to lessen the fold.
I don't correct the lines or fold 100% as it looks unnatural. For the lines or fold, I use superficial HA to correct it.
I hope this answers your query.
Thank You
Dr Joshua Lim
