The correct teeth clipping pliers are available from good pet shops
Not exactly they could use them to help their teeth that never stop growing.
One example would be your teeth. Of course you use all your teeth to eat but each tooth has a job .For example your front teeth are to cut not chew and your back teeth were to chew not to cut.
They would use the teeth of buffalo.
They have front gnawing teeth designed for the job.
your teeth
No, don't use crittertrail cages with gerbils. Unlike hamsters, gerbils are chewing machines. They can ingest the plastic which can kill them, and by chewing the plastic they can escape. I would use a 10 gallon tank instead. Gerbils cost around $10 each from a pet shop.
Gerbils use squeaks that sound like 'bird tweets' as a sign of communication between other gerbils. If you have more than one gerbil, you would hear them squeaking at eachother. Its really cute though :)
I use a very fine tooth 'toolbox saw'. This is a short firm saw with twelve small teeth per inch. Makes a very smooth cut in plastics of any kind.
yes of course they use their teeth, how else would they bite?
Well speak with your dentist. It is very common for them to cut your gums between your teeth and use braces.
balance
There are a few reasons for this. Some might be trying to get out. Others use this as a method to mark tehir territory, or to explore the spaces they are in. Also, gerbils need to knaw down their teeth and wear away their claws. To do so naturally, they chew and scratch on ahrd surfaces.