Concussion involved injury to supporting structures of the tooth, without loosening or displacement. Tooth is tender to percussion.
Subluxation involves injury to
supporting structures of the tooth
with loosening but no displacement.
The tooth is tender to percussion,
with bleeding at the gingival margin.
This type of injury requires prompt referral to a dentist for repositioning of the injured tooth/teeth.
Even primary teeth should be examined by a dentist, because the Underlying permanent tooth may be injured.