A surprising reason why pen caps have hole in them

We all have a terrible habbit of chewing pen caps.I also had this habbit when i was trying to solve math problems.But some kids accedently swallow the pen caps.This lead the BIC company to add a hole on pen caps.

The pen caps have holes in them to prevent suffocation, in case they were swallowed.

One of the oldest and more popular ballpoints were the Bic Cristal who originally made it part of their design to include a small hole at the end of the cap. Considering that pen caps were one of the common objects swallowed by children causing them to choke and proved fatal. The hole was put in to allow passage of air in case the dreadful event happened; since, we all love putting them in our mouths.

So, think about it, if by any chance, you swallow a cap, it would be much easier to find itself in the trachea and it could block the respiratory system. Here comes the best part – the holes in the bottom of the cap allow a flow of necessary amount of oxygen to survive, until the ambulance arrives.

source-Quora 

Note - Chewing your pen lid too much can turn your teeth brown and even damage your facial muscles, experts have said.If you regularly chew on your pen lid, you could risk damaging the muscles around your mouth, causing lockjaw, and wearing down your teeth