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))))))))) (. .)))
Church is perhaps not as suitable a platform for being a Dentistry ambassador than social events. 
( Church ( ( ( ( is perhaps ) not ) ( ( as ( suitable ( a platform ) ) ) ( for ( being ( ( a ( Dentistry ambassador ) ) ( than ( social events ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Church)) (VP (VBZ is) (ADVP (RB perhaps)) (RB not) (ADJP (ADJP (RB as) (JJ suitable) (NP (DT a) (NN platform))) (PP (IN for) (S (VP (VBG being) (NP (NP (DT a) (NNP Dentistry) (NN ambassador)) (PP (IN than) (NP (JJ social) (NNS events))))))))) (. .)))