STEM by SAI CHUEN LEE https://padlet.com/s1124919/di4kdmmf0ktcnyk1 ♥之作 en-us 2021-02-06 08:35:47 UTC 2023-03-02 12:45:38 UTC hello@padlet.com Around 1780: William Addis invented the first more modern toothbrush in England. s1124919 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171044274 The handles were carved out of the bone of cattle and the heads of the natural bristles were placed in the bored holes made in the bone and kept in place by thin wire. ]]> 2021-02-06 09:08:16 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171044274 Ancient Greece and Romania s11239451 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171046617 People used ashes, charcoal, salt solution, sand and branches to clean mouth]]> 2021-02-06 09:10:22 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171046617 600 BC s11239451 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171047213 prophet Muhammad started to promote the use of toothbrush. Holding a flossing stick to bite the stick while flossing]]> 2021-02-06 09:10:58 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171047213 Inspiration of William Addis s1124919 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171049435 While in prison, and observing the use of a broom to sweep the floor, he decided that the prevalent method used was ineffective and could be improved. 

Use: a small animal bone left over from dinner
bristles from guard
sealed with glue]]> 2021-02-06 09:13:01 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171049435 Tong Dynasty https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171050856 ox bone  & bristle from pig]]> 2021-02-06 09:14:33 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171050856 Ancient Arab s11239451 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171057415 Get the branches from Arak tree and make it as toothbrush called Miswak]]> 2021-02-06 09:21:26 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171057415 Before Tong Dynasty s1120779 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171061788 Willow branches 楊柳枝

]]> 2021-02-06 09:25:41 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171061788 Song Dynasty s1120779 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171066345 Improvement of making the shape of brush holder and brush head -> increasing the number of brush holes and bristles

]]> 2021-02-06 09:30:00 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171066345 Natural animal bristles were eventually replaced by synthetic fibers s1124919 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171066855 In 1935, the fiber known as nylon was patented by Du Pont Laboratories.
In 1938, nylon bristles made their way into toothbrushes.
The first nylon toothbrush was introduced under the brand name “Doctor West’s Miracle-Tuft Toothbrush”.

]]> 2021-02-06 09:30:31 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171066855 LED toothbrush https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171067036 For kids
Time control
encourage kids to brush tooth with a suitable time ]]> 2021-02-06 09:30:40 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171067036 Chewable toothbrush https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171070995 Portable 
brush tooth anytime]]> 2021-02-06 09:34:35 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171070995 Ming Dynasty s1120779 https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171075051 diversification of the outlook of brush holder]]> 2021-02-06 09:38:37 UTC https://padlet.com/s1124919/di4kdmmf0ktcnyk1/wish/1171075051