Is it normal that directly teeth looked cracked?
Okay so I got my braces off Monday and they used this high speed drill thing to shape my teeth and I have sensitive teeth so that hurt very much, anyways After the braces my teeth looked a little yellow so I bought crest White strips professional whitening strips and that same day I tried using them I had to take them off though after just 3 minutes because my teeth kept getting sharp and very painful pains for moments at a time. Now today ( 2 days later) I tried again this time the pains were not as bad so i resisted them and kept the strips on for 20 minutes now afterwards i can see like little lines on my teeth almost looking like cracks. Im worried if the strip was cracking my teeth ( hence the sharp pains) is this normal?