Yes
Well as long as there has been no issues with the healing of the piercing, and the piercing has been allowed to season (is over a year old) the entry and exit points will be about the same skin tone as the surrounding tissue. So the "scar" wouldn't be too noticeable.
I am guessing this is a serious question, so if you keep your mouth shut no one will notice a tongue piercing and if you don't chew gum like a cow or laugh open mouthed you should be fine. Being an oral piercing they are not noticeable at all unless you draw attention to it, that's why I couldn't believe this was a legit question, so there you go.
I should think that ear piercing is the least painful
It depends. If the piercing has migrated or had an advanced infection, then there can be significant scarring. If the piercing healed smoothly and has never had a problem, the scarring should be slim, like a tiny dot.
When I take out my nose ring I cant even notice the hole.
You cannot "cure" a piercing, per-se. If you remove a lip piercing, the hole will close as with any other piercing, though, depending on how long the piercing was in place will define the length of time it takes for the piercing to close entirely. if the piercing has been in place for some time, there is a likelihood that the piercing will scar. The scar will not be immediately noticeable, and will take the shape- in most cases- of a small crater at the site of the piercing.
No. Retainers are made of plastic which is not suitable for initial piercing. Initial piercing should always be done with a titanium barbell.
No, but you can buy a retainer which will make it less noticeable.
Depends on the gauge. Mine is 16 gauge and isn't any bigger then my lobe holes.
You have to be at least 14 with a parents signature as well as yours where ever you get the piercing done.
You have to be 16 at least anywhere in Canada to sign for your own piercing