Impression at the orthodontist

so today I went to the orthodontist to get my sisters appointment so she get out retainer but they told me that why don't we just have Grace for a check up since she's here. So, my mom said lets do it! After my sisters check up I went to get mine I have been going to the orthodontist since I was 7 years old also I had to get a lot of teeth polled out I even got my baby molers pulled out. So they said lets do impressions on your teeth and take photos (x-Rays). I had impressions on my top and bottom teeth. The bottom teeth hurt the most when they pulled it out. So that was the end of of my impressions.