Whats the softest and most natural filler for the lips?

Thank you for your questions.  Unfortunately without an in-person evaluation or full series of photographs it is difficult to make the best recommendations.  In general I prefer hyaluronic acids for lip augmentations, such as juvederm while a thicker gel is better for the cheeks, such as Voluma.  Very fine lines can be treated with Belotero. Hope that this helps.

When it comes to fillers, your results are dependent on the injector, rather than which filler product is used.  If you have had a problem more than once with the same injector, it's time to change.  Make sure you go to a board certified dermatologist or plastic surgeon who injects A LOT, not someone who does it once a week or has his or her nurse doing most of the injections.  That being said, Juvederm, Restyiane and Restylane Silk are my preferred lip fillers, Voluma for cheeks and Restyoane Silk for fine lines.