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Tartar.

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Q: The herd crust like substance that forms your teeth when plaque hardens is?
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Related questions

What do ingeous rocks form from?

a type of rock that forms when magma cools and hardens very slowly deep in earths crust...


What is the soft sticky film created by bacteria that lives in your mouth?

The soft sticky film is called plaque. When plaque is not brushed away, it hardens and forms tartar on the teeth. Tartar must be scraped away with a metal dental instrument & cannot be removed by simple brushing. Brush away plaque so it does not have time to harden into tartar.


Magma that hardens vertically underneath the surface will form a sill?

No. A sill forms when magma hardens parallel to the rock layers, which is usually horizontal. When magam hardens vertically, it forms a dike.


What rocks form when magma cools and hardens?

Igneous rock is what forms when magma cools and hardens.


How do a fossil forms?

it hardens and molds the shape


The hawaiia volcanoes formed as a result of?

They are formed in a very different way. Unlike usually Hawaii is on top of a "hotspot" or a very weak spot in the crust where the mantle breaks out, hardens and forms a volcano.


What forms when magma hardens in a pipe?

a volcanic neck


What hardens and cools beneath earth's surface when an intrusive igneous rock forms?

The substance that cools beneath the earths surface when an intrusive igneous rock forms is Magma. Magma is a molten material made up of rocks and minerals.


What is biofilm?

Biofilm forms when bacteria sticks to surfaces in moist environments by excreting a slimy substance. Examples of this would be the slippery rocks on the bottom of a stream or plaque on teeth.


When melted rock cools or hardens in or under earth surface it forms to what?

it forms to a mineral


What is the sticky coating that forms on teeth?

Plaque


What is it called when magma hardens in a volcanoes pipe?

a volcanic neck forms when magma hardens in a volcano's pipe and is later exposed.