The word endodontics 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: 18
Highest Scoring Words With Friends™ Play In The Letters endodontics
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Seven Letter Word Alert: (28 words)
coedits, condone, connote, consent, contend, cooties, dentins, desnood, distend, indents, intends, intoned, intones, ionones, isodont, nondiet, noticed, notices, notions, osteoid, scooted, section, snooded, snooted, tendons, tension, toddies, toonies