The word fluoridating is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 21
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (71 words)
adoring, aground, airfoil, airlift, angioid, auditor, darling, darting, dialing, difuran, digital, dilator, dilogun, diurnal, failing, fairing, figural, flaring, fluting, foaling, foiling, folding, fouling, frontal, fungoid, furling, furlong, gainful, ignitor, indraft, ingraft, intagli, inuloid, lairing, languid, languor, larding, lauding, lauroid, lifting, loading, loafing, lofting, nodular, orating, ordinal, outdrag, outfind, outgain, outgrin, rafting, raiding, railing, rainout, rifling, rifting, rioting, roiling, rotunda, routing, tailfin, tailgun, tailing, talonid, tinfoil, toiling, touring, trading, trifold, turfing, ungraft