( ( Damage ( to ( ( the ( sensory ( hair cells ) ) ) ( in ( the ( inner ear ) ) ) ) ) ) ( ( is ( ( the ( ( most frequent ) cause ) ) ( of ( permanent ( hearing loss ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Damage)) (PP (TO to) (NP (NP (DT the) (JJ sensory) (NN hair) (NNS cells)) (PP (IN in) (NP (DT the) (JJ inner) (NN ear)))))) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ frequent)) (NN cause)) (PP (IN of) (NP (JJ permanent) (NN hearing) (NN loss))))) (. .)))
Damage to the sensory hair cells in the inner ear is the most frequent cause of permanent hearing loss.
(ROOT (S (NP (NNP Loud)) (VP (VBZ sounds) (SBAR (IN that) (S (NP (NN cause) (NN hearing) (NN loss)) (VP (VBP damage) (NP (NP (DT the) (NN hair) (NNS cells)) (PP (IN in) (NP (DT the) (JJ inner) (NN ear)))))))) (. .)))