( ( ( ( ( ( ( Tooth brushing ) ( with ( salt water ) ) ) ( ( is not ) refreshing ) ) , ) but ) ( ( a ( salt ( water shower ) ) ) ( is ( the pits ) ) ) ) . )
(ROOT (S (S (NP (NP (NNP Tooth) (NNP brushing)) (PP (IN with) (NP (NN salt) (NN water)))) (VP (VBZ is) (RB not) (ADJP (JJ refreshing)))) (, ,) (CC but) (S (NP (DT a) (NN salt) (NN water) (NN shower)) (VP (VBZ is) (NP (DT the) (NNS pits)))) (. .)))
Tooth brushing with salt water is not refreshing, but a salt water shower is the pits.
(ROOT (S (NP (PRP It)) (VP (MD would) (VP (VB help) (NP (JJ conserve) (NN water)) (S (VP (TO to) (VP (VB turn) (PRT (RP off)) (NP (NN water)) (PP (IN while) (S (VP (VBG brushing) (NP (NNS teeth)))))))))) (. .)))
It would help conserve water to turn off water while brushing teeth.