Injuries to primary teeth are most common in children aged 1.5 to 2.5 years, as this is a developmental stage where children are learning to walk and explore their environment, leading to a higher risk of falls and accidents.

Undermining resorption occurs due to necrosis of bone on the compression side as a result of occlusal trauma.

If prematurity occurs in retruded contact position (RCP) on maxillary premolar, the surface of the tooth involved is the mesial of the lingual cusp.

A pseudo pocket may have a depth of more than 3 mm.

A gingival index score of 1 means bleeding on probing.