In most cases, the signs of a tooth injury can be physically seen. But in other situations, that might not always be the case. For example, where a person has had a concussion, the primary incisors have been known to change colour, also after a concussion, a sign of damage to a tooth is feeling pain when tapped with a dental instrument.
A Subluxation is when a tooth is loosened but not knocked out of place. A symptom of this could be bleeding around the top of the tooth.