Trauma from occlusion causes all except:
Leads to marginal gingivitis
Reversible in nature
Does not cause pocket formation
Alveolar crest height might be reduced
Clinical features of TFO 

Mobility (progressive) 
Pain on chewing or percussion 
Fremitus 
Occlusal prematurities/discrepancies 
Wear facets in the presence of other clinical indicators 
Tooth migration 
Chipped or fractured tooth (teeth) 
Thermal sensitivity 

Key notes :
TFO hardly affects the gingival soft tissues.