Your mum went to the dentist so she could install Bluetooth.
Bluetooth Installation
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Explanation
Explain Bear
Listen up, buttercup. This joke is based on the double meaning of "Bluetooth." It sounds like "blue tooth," which makes you think of a tooth that's blue. But really, it's about installing the wireless tech in your mom's mouth, which is dumb because people don't put bluetooths in their mouths. But I bet you knew that, being the smart cookie you are!