CoolSculpting works via a process called cryoliposis, which is basically the selective destruction of fat cells. The number of treatments needed vary from patient to patient. Something to keep in mind is that it is difficult to look at one area of the tummy, for example the lower abdomen, without looking at the entire area holistically. For the absolute best results, the upper and lower stomach should be treated as well as the flanks/love handles. That way the entire area is being treated and results will be more uniform and noticeable. For some patients, just one treatment per area is fine but generally speaking, most people need at least two treatments. If you are considering doing CoolSculpting, I recommend approaching the treatment holistically and doing two treatments per area. The results will last for as long as you are able to maintain them. Think about it this way, if someone gets liposuction, the fat removed is gone. That specific fat will not come back BUT if the person does not exercise or maintain a healthy lifestyle, then they may develop fat again in those areas. It is difficult for any doctor to say anything is gone forever. In regards to CoolSculpting, there is not an expiration date on the results. The long-term results depend on you. It is always best to make a consultation appointment with your doctor to see if CoolSculpting is right for you.