theme 4: how teeth work,science 5
Theme 4: how teeth work
1- Put a (/) for true and a(x) for false.
(a) The surface of tooth is harder than bones. ( )
Reason --------------------------------------------------------------------------------------
(b) Every time a tooth falls off, a new tooth grows in its place. ( )
Reason --------------------------------------------------------------------------------------
(c) All teeth can cut, grind and tear. ( )
Reason --------------------------------------------------------------------------------------
(d) Once cavities are formed in a tooth the tooth, has to be taken out. ( )
Reason --------------------------------------------------------------------------------------
(e) Once cavities are formed, germs start living in them. ( )
Reason --------------------------------------------------------------------------------------
(f) All teeth have the same shape. ( )
Reason --------------------------------------------------------------------------------------
2- Name these:
(a) Teeth that fall off and are replaced by new teeth. --------------------------
(b) Tearing teeth. ------------------------------
(c) Paste like material that sticks to teeth if you do not brush. -----------------------
(d) The doctor who treats your teeth if you do not brush. ---------------------------
(e) Doctors can stop cavities by it. ---------------------------------
(f) The natural tooth brush. ----------------------------------
3- What is each of these useful for?
Incisors ----------------------------------------------------------------------------------------
Canines ----------------------------------------------------------------------------------------
Premolars and molars -----------------------------------------------------------------------
4- How do cavities develop in teeth?
--------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------
5- Complete:
(a) a child's first set of teeth are-------------.these fall off and are replaced by the --------------------------teeth.
(b) we have different kinds of teeth :---------- for cutting,------------- for tearing and-----------and----------------for crushing and grinding food.
(c) if teeth are not best kept clean , -----------------can develop in them.
(d) --------------is the best option for cleaning the teeth.
(e) we should ---------our teeth because no new teeth will appear in their place.
6- How to brush your teeth?
--------------------------------------------------------------------------------------------------
7- How are you taking care of teeth?
-----------------------------,----------------------------------,---------------------------------
8- What kinds of teeth?
------------------------,--------------------,-------------------,-------------------------
9- What causes problems in the teeth?
--------------------------------------------------------------------------------------------------
10- What is structure of a tooth?
-----------------,----------------,-----------------,------------------,----------------,----------
11- Write the steps of developing cavities: (how do cavities develop?)
1-------------------------------------------------,2---------------------------------------------
3------------------------------------------------,4----------------------------------------------
12-what is the best time to clean up your teeth?
--------------------------------------------------------------------------------------------------
13- What is the natural brush? Where do we get it from?
--------------------------------------------------------------------------------------------------
14- The natural brush is useful for our teeth, how?
--------------------------------------------------------------------------------------------------
15- What the functions of the part? What the number? What the shapes?
Incisors------------------------------------------------------, premolars---------------------
Canines-----------------------------------------------------, molars--------------------------
