Why Did My Invisalign Crack?

I’m using Invisalign teen, and both of my aligners are starting to crack near the gum line, between two teeth. They are both cracking in the same spot, but on opposite sides of my mouth. The orthodontist suggested that I may be clenching my teeth when I sleep, which may be the case, but I have no way of knowing this for sure. What could have caused it to crack? Any suggestions would also be appreciated.

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