When it comes to lip fillers, more is not better, especially if you want natural and subtle results. Also, the lip enhancement treatment is custom-made and tailored to your case. So, your doctor will consider your facial anatomy, lip volume, lip concerns, and goals.
Most dermal fillers come in syringes of 1ml, but how much is used depends on the initial consultation. After that, your doctor will design the treatment plan and suggest the quantity of filler (generally between 0.5ml /1ml) to give you the desired results.