If your school does not allow tongue piercings there are various different ways that you can hide your piercing. Tongue retainers are cheap and widely available, so you can stock up on a few or experiment with a few different types before finding the right tongue retainer for you.
The easiest thing about hiding your tongue piercing is its location – when your mouth is closed no one can even see it! If no one at school knows about your tongue piercing the best advice is to keep quiet about it and use a tongue retainer right from the beginning. That way, no one will have the chance to find you out. There are a few different types of tongue retainers and they all have their different advantages. In the end it often comes down to the way they feel. Your mouth is very sensitive and different people will find different tongue retainers comfortable to wear.
Acrylic Tongue Retainers
These acrylic dome tongue retainers are a great option for school or work. They consist of a straight bar with a half-dome on either end. They come in three colours and you can barely feel them in your mouth. I recommend the clear tongue retainer but some people can get away with either the pink or orange versions. Whether or not you find these tongue retainers comfortable varies from person to person. Some people find that the edges of the dome press into their tongue while other people find them really comfy.