There are several reasons why tongue piercing is not healthy for you, but I just read of a new reason. Playing with a tongue stud can cause your front teeth to spread, leaving a gap. People with tongue studs tend to push the stud up against their front teeth. This can cause the teeth to separate. Forces cause teeth to move and the stud is a force that acts similarly to an orthodontic appliance. So, if you have a tongue stud, don’t play with it and don’t push it up against your teeth. Tongue piercing can also injure the gums and cause mouth infections.