A lip lift offers a permanent solution to thin lips which lack definition and volume. Lip fillers are only a temporary fix and the procedure needs to be repeated regularly in order to maintain the results. Lip fillers are a great way to introduce volume to thin lips, but not definition. Some people do not like the results from lip fillers as they feel it looks too artificial. However the process can be easily reversed if someone is not happy with the results of their fillers. An upper lip lift would require further surgery to correct if the patient is unhappy with the result.