- Infections during piercing and after healing (hepatitis, HIV, tetanus, bacteria, and yeast)
- Bleeding
- Damage to nerves
- Wrong kind of jewellery for the area pierced
- too small (e.g. a ring too small can actually cut off the blood supply to the tissue, causing swelling and pain)
- too thin or too heavy
- allergic to the metal ("tingly feeling", diffuse swelling, persistent irritation despite effective oral hygiene)
- Keloids (thick scarring at the piercing site)
- Hyperplastic tissue (excess) around piercing
- Dental damage/concerns
- Swelling and infection of tongue
- Chipped and broken teeth (occurs mostly within two months of acquiring the barbell)
- Obscuring teeth during x-rays or treatment
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