Yellow teeth indicate an addiction to smoking cigarettes, drinking coffee, or swishing with butter. Undo unsightly dairy habits with today's Groupon: for $39, you get two back-to-back 20-minute teeth-whitening sessions at Pure Image in Thornhill (a $299 value).

Pure Image's cosmetic team combines dental-grade gel with a cool blue laser LED technology to render gleaming smiles up to 10 shades brighter. For each 20-minute session, a skilled technician coats teeth in a hydrogen-peroxide gel before reciting an ancient whitening spell. The solution then travels deep into dentin to target stains while the technician places an LED blue light directly in front of chompers to help activate the enamel's whitewashing power. Meanwhile, the mixture hydrates teeth to help minimize sensitivity. The noninvasive whitening procedure results in virtually no downtime, allowing tooth owners to return to the office and start smiling silently over their coworkers' shoulders almost immediately.