Like a firm handshake, a bright toothy grin is a universal greeting, a symbol of goodwill, and usually implied on business cards via emoticons. Improve live-action smiles with today's Groupon to Cromwell Dental. Choose from the following options:

• For $169, you get an in-office Zoom! teeth-whitening treatment (a $600 value).
• For $99, you get a new-patient exam, cleaning, and full set of x-rays (a $328 value).
• For $39, you get an Invisalign exam, treatment, and impressions (a $79 value) plus a $1,000 credit toward a full Invisalign treatment.

Cromwell's licensed and experienced dentists and staff tune up teeth with dental expertise and a friendly chairside manner. Enlighten dim molars with an in-office Zoom! teeth-whitening treatment, which yields long-lasting and generally effective results, requiring touch-ups every few years to remove coffee, wine, and ink-stain buildup. New patients can opt for a full dental exam, expediting the process by filling out an information packet before visiting Cromwell's sleek and inviting office, where tastefully bright colors, high-tech equipment, and streamlined chairs let clients know what it's like to get a fluoride rinse on the bridge of the Enterprise.

Choose the Invisalign exam and initial tooth impression along with a $1,000 credit toward a full treatment (usually $5,500+) to help straighten wayward dentricles without the discomfort of braces. Each set of transparent aligners discreetly corrects teeth and, after about a year, most patients will see a full tectonic shift ending the old crowded age of dental Pangea for a new dawn of well-spaced chompers.