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Why Do Retainers Crack? [Solved]

And don’t let it get too dry – the plastic can crack. To keep it from cracking, soak your retainer when it isn’t in your mouth. Another tip: Don’t bend the wires or your retainer will not fit properly. Be careful when inserting and removing the retainer – and when it’s in your mouth.

Cracked Retainer After Braces or Invisalign: Now What?

What

Cracked, Lost, Broken Braces Retainers - Need to Replace yours?!

Braces 101 – Invisalign / Dental Braces

How to fix your cracked retainer

This is the website I got it from.