Everything we do in life involves risks. Sometimes we like to change the way we look. Cosmetic dentistry involves changing the way we look and therefore, perhaps, the way we feel about ourselves. Mouth and tongue piercing also can change the way we look and feel about ourselves.
On the Internet you can access a lot of information about mouth and tongue piercing.
Below are photos of an Australian example of the minor, but critical, damage a lip bolt can do. This won't happen to everyone with a lip bolt. Ask the dentist for advice and check out the other risks so you approach body piercing as an informed consumer.