blue??

[mark.s..]

if  you have 2 cars, both equipped with Bluetooth, do you say you've 2 blueteeth, 2 Bluetooth or 2 bluetooths? or 2 Bluetooth appliances.  if  blueteeth, time for a dentist visit

[parkaner]

Bluetooth is a proper noun (ie, it is a brandname with a capital letter), so technically it would just have an s on the end.
But if you say a Bluetooth car, then it is really an adjective, so it is 'car' that should be pluralised.
But at the end of the day you just wanted to boast about having 2 cars didn't you

[mark.s..]

haha,, no I only have one car, and no Bluetooth. I struggle to use a landline. only bluetooths I have is when I chew too hard on Bics.  besides, don't have any friends to call me anyway