Hi Vito from New York! People just do not out right quit! They slowly stop wearing their aligners because it interferes with their life style more than they thought it would! You should be wearing these aligners 22 hours a day and every time you eat or snack you need to take them out and then brush your teeth and put them back in again. It is a good way to diet but sometimes people slowly slack off and just stop. Invisalign is a wonderful way to achieve beautifully straight teeth, but you have to be compliant and stick with the program which usually last a year or more. If you are just interested in correcting your smile, Six Month Smile may be a better way to go! This procedure straightens the front teeth and gives you a great smile. Less expensive and shorter treatment plan!