Each of us needs to be ambassadors for Dentistry within our own practices, and at church, athletic and social events.
( ( Each ( of us ) ) ( ( needs ( to ( be ( ( ambassadors ( for Dentistry ) ) ( ( ( ( within ( our ( own practices ) ) ) , ) and ) ( at ( church ( , ( athletic ( and ( social events ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Each)) (PP (IN of) (NP (PRP us)))) (VP (VBZ needs) (S (VP (TO to) (VP (VB be) (VP (VBN ambassadors) (PP (IN for) (NP (NNP Dentistry))) (PP (PP (IN within) (NP (PRP$ our) (JJ own) (NNS practices))) (, ,) (CC and) (PP (IN at) (NP (NN church) (, ,) (JJ athletic) (CC and) (JJ social) (NNS events))))))))) (. .)))
We all need to lift up the banner of Dentistry wherever we may be. 
( We ( all ( ( need ( to ( ( ( lift up ) ( ( the banner ) ( of Dentistry ) ) ) ( wherever ( we ( may be ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP We)) (ADVP (DT all)) (VP (VBP need) (S (VP (TO to) (VP (VB lift) (PRT (RP up)) (NP (NP (DT the) (NN banner)) (PP (IN of) (NP (NNP Dentistry)))) (SBAR (WHADVP (WRB wherever)) (S (NP (PRP we)) (VP (MD may) (VP (VB be))))))))) (. .)))