Yellow teeth indicate an addiction to smoking cigarettes, drinking coffee, or swishing with butter. Undo unsightly dairy habits with today's Groupon: for $49, you get a professional take-home bleaching kit from Smiling Edge (a $279 value).

Smiling Edge's professional staff strive to supply Ottawans with at-home whitening kits that rival the potency and safety of professional in-office treatments. Each professional take-home bleaching kit includes one set of upper and lower thermoform trays that capture custom-fitted impressions of teeth and any permanent gumdrops. Domicile dwellers line the mouth moulds with a 35% carbamide peroxide gel from a 10-cubic-centimetre syringe, enough for 7–14 daily treatments that span 30–60 minutes each. Results may be noticeable as quickly as the first treatment, and optimal results typically occur around the 10th treatment, which may be expedited by chewing chalk. Kits also contain instructions, a 3-cubic-centimetre syringe of mineralizing gel, and a storage container for mouth trays, all of which hang out in a blue zippered case between uses. Buyers can redeem today's deal through Smiling Edge's website.