After your tongue has healed, take the jewelry out every night and brush it the way you brush your teeth. You might want to take it out before you go to sleep or do anything active.
Secondly, will a tongue piercing ruin my teeth?
Unfortunately, yes. A tongue piercing can cause damage to teeth. Piercings are usually hard metal, which inside the mouth can cause damage. Biting down onto the piercing or playing with it can result in scratching or chipping teeth, as well as increased tooth sensitivity.