The word periodontal 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: 17
Highest Scoring Words With Friends™ Play In The Letters periodontal
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Seven Letter Word Alert: (84 words)
adopter, aileron, aneroid, delator, detrain, dilater, dilator, diopter, dioptre, dipolar, droplet, elation, latrine, leopard, leotard, lipread, loonier, loopier, nepotal, notepad, odorant, opaline, operand, operant, opiated, optrode, oration, ordinal, otarine, painted, painter, paroled, parotid, patined, pentail, peridot, pertain, piloted, pirated, plainer, plaited, planted, planter, platoon, pointed, pointer, polaron, politer, portend, portion, praline, predial, preload, printed, proline, pronate, protean, protein, ratline, readopt, reliant, repaint, repilot, replait, replant, repoint, retinal, retinol, tadpole, talonid, telopod, tendril, toenail, topline, toprail, tornado, torpedo, tradein, trailed, trained, trenail, tripled, tripole, trooped