Claire's don't perform piercings, they use piercing guns. If you want to get a piercing then go to a studio with a professional piercing using the correct and safe equipment.
You should never pierce your cartilage with guns. It will damage your body tissue and you will find a lump growing outside the piercing after a while. Guns are only safe for piercing the soft fleshy parts of your earlobes. Nowhere else. Safest is to go to a pro-piercing artist, he/she should use proper hollowed and sterilised or brand new needles to pierce. It doesn't hurt at all if the piercing is done professionally.
A Professionals Opinion If you want piercings that look good right from the start and will allow you to get more down the road that allow for a flow effect, go for the needle piercing. Done by a professional body piercer the piercings will be next to painless, the jewellery will look good and be easy to care for and you will be safe in the knowledge that a licensed and inspected professional has provided the service in a safe and knowledgeable manner. Piercing guns are dirty, the studs are generally the cheapest material of questionable quality and the operator generally doesn't know how to provide the service in a safe manner without cross contaminating themselves and your piercing in the process. A free piercing is never really free when it comes to piercing guns.
Piercing Yes, Vampire Bites are not so safe. Depends on where they bite you...
Disposable aprons are used by doctors and nurses and the like. They are disposable because after use, they might be contaminated and not safe to use anymore.
They're not recommended, they're not as hygienic and safe as conventional piercing. If you must use a gun make sure to inquire if it is a single use gun or a gun with a disposable cartridge because they are much more safer than guns that are re-usable. Re-usable guns are popular with malls and shopping centres and the people who use them usually do not have the proper training in handling such equipment such as; sterilising it, storing it and using it. Some have been lucky enough not to get infections from piercings with the conventional re-usable gun, but having them done this way is still risky as re-usable guns can not be put in an autoclave and properly sterilised. It is also recommended that piercing guns be used ONLY on the ears. It is also recommended that with every piercing you clean it twice a day with saline solution and avoid touching it to avoid infection. Initial piercings should be kept in for at least 6 weeks to avoid premature healing.
I doubt its safe for anything to go inside a lip piercing. Unless its healed.
Perfectly safe. The nose and the urinary tract are far from each other and shouldn't have much of an effect on piercing.
A piercing gun should not be used on cartilage as it's more likely to cause damage to the cartilage. Piercing guns should be avoided at all costs due to the multiple health risks. If you want a piercing go to a piercing studio where there are professionally trained piercers who use the correct jewelry and safe tools.
No.
Like anything a gun can be misused. However, guns today are safe in that they do what a human makes them do.
Nail guns are safe only when used by someone who is competent and familiar with power tools.