( ( ( Three factors ) ( that ( contribute ( to ( ( the development ) ( of ( thickened saliva ) ) ) ) ) ) ) ( ( ( ( are ( mouth breathing ) ) , ) ( pooling ( of ( saliva ( in ( the ( oral ( ( cavity and ) dehydration ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD Three) (NNS factors)) (SBAR (WHNP (WDT that)) (S (VP (VBP contribute) (PP (TO to) (NP (NP (DT the) (NN development)) (PP (IN of) (NP (JJ thickened) (NN saliva))))))))) (VP (VBP are) (NP (NN mouth) (NN breathing)) (, ,) (S (VP (VBG pooling) (PP (IN of) (NP (NP (NN saliva)) (PP (IN in) (NP (DT the) (JJ oral) (NN cavity) (CC and) (NN dehydration)))))))) (. .)))
Three factors that contribute to the development of thickened saliva are mouth breathing, pooling of saliva in the oral cavity and dehydration.
(ROOT (S (NP (NNP Saliva) (NNP secretion)) (VP (VBZ initiates) (NP (NN chemical) (NN digestion)) (PP (IN while) (S (ADVP (RB also)) (VP (VBG protecting) (NP (DT the) (JJ oral) (NN cavity)))))) (. .)))