Again, if all the stores that do not keep it clean. Drilling tools are not standard, it may be causing the symptoms, infection is spread out swamps. Which is something that lots of dangers.
And if that does not penetrate the shop clean. Drilling tools used are not standardized. It may also cause purulent infection spread. This is very dangerous.
And if the drill with the shop doesn't keep clean. Tools used to drill is not standard. It may also cause infection, purulent spread. Which is very, very dangerous.