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Question:

Why does the dentists ask you to bite on this black sheet of rubber or plastic at the end?

At the end of my dentist appointment, my dentist asked to bite down hard on this black sheet of rubber or plastic and then he would pull it out.

Answer:

He must have taken a imprint of your teeth.
Sounds like he was using articulating paper. You bite on it and it leaves a colour (usually red or blue) on the teeth were they touch the opposing teeth. If your dentist has just done a filling for example they will check that they have not altered your bite by propping your mouth open or allowing no contact to be made, as both of these situations will cause problems. However if if was a rubbery mixture in a tray which was inserted over all your teeth and you were asked to bite into it, he was taking impressions. If your still unsure just ask, im bet he will be pleased to tell you hope this helps :-)

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