Lip fillers only last one month. Any suggestions?

That is not normal.  They are injecting too deep.  You need to find someone that knows how to do this procedure.

Hello,
Thank
you for your question.
Based on
your goals, you may want to consider a fat transplantation.
Fat transplantation, or fat grafting, involves the
removal of a specific amount of fat from your body so it can be re-injected
into your face. The donor site is an area that has a readily available supply
of subcutaneous fat, such as the abdomen or thighs—areas that you may find look
more toned to a certain extent afterwards! This method of facial contouring can
resolve such concerns as nasolabial folds (creases extending vertically on
either side of the nose to the mouth) and thin or asymmetric lips (lip augmentation). 
I'd
recommend speaking to a Board Certified Plastic Surgeon to determine if you're
a good candidate for this procedure.
Take
care.

Thanks for your question.If you like there is a permanent lip implant that you can use.  Its called Surgi-sil Permalip.  I have done many of them with great results and happy patients.  And if ever you dont like them they can be pulled out.  The scar is minimal and it can be done under local just like going to the dentist for a dental procedure.  I have a picture of one on instagram if you like to see at #drsaullahijani.  It works well and you dont need to keep redoing your lips!!Thank you