Why is it a toothbrush and not a teethbrush? Anyone know?

Answer 1

Because it was invented in West Virginia, where "Nice tooth" is a good pick-up line.
Because it was invented in Kentucky.
Because it was invented in Arkansas.
Because it was invented in Alabama.
Because it was invented in Maine.
Because it was invented by a blonde.
Because it was invented by a hillbilly.
Because it was invented by a Willie Nelson roadie.
Because it was invented by an NHS dentist in the UK.
Because you are supposed to brush one tooth at the time.
Because they didn't want to make people who have only one tooth feel bad.
Because the original toothbrush was a frayed twig and you could only brush one tooth at a time.
Why is it called a "pair" of pants?

Serious answers:

Compound words in English are almost always if not always formed with the singular word, such as mousetrap, football, bookcase, bedroom and toothbrush

http://www.loc.gov/rr/scitech/mysteries/tooth.html

Answer 2

Same reason we drive on a parkway and park in a driveway!

Actually it is because the original toothbrush was simply a frayed twig and could only brush one tooth at a time.

Answer 3

Hillbilly thing, Tooth brush. Clem go brush your tooth

Answer 4

Well obviously you've been doing it wrong. One is supposed to brush their teeth one tooth at a time.

Answer 5

The guy who invented it only had 1 tooth left.

Answer 6

Haven't you noticed how corrupted the English language is in the first place?

Why is it drank and not drinked? Why is it "I have drunk water" and not "I have drinken water"?

Why is it "I lie down after work" and not "I lay down after work"?

WHY?!

Answer 7

for the same reason we have one pair of glasses, pants and a hair brush. (which hair will you brush?)

Answer 8

Because they were thinking of the tooth fairy!!!!