Ear candling is procedure often used by alternative medicine practitioners for reasons they claim including: removing toxins, relieving sinus pressure, curing ear infections, helping with vertigo, improving hearing, purifying blood and much more. There is no scientific evidence to support any of those claims. Proponents often show some nasty discoloured gook in the candle after a session as proof. This stuff actually is the residue from the candle itself. Just burning one without use on an ear has the same exact effect as with use on an ear. Tests have shown that there is not enough suction created from ear candling to cause ear wax to be pulled from the ear.
Health Canada considers ear candles to be Medical Devices and as such require licenses for the sale of them. Since they are considered dangerous, Health Canada has not issued any licenses and therefore, the sale, and import of any ear candle is illegal. They recommend if you do have compacted wax to seek a health care professional who will use proper equipment to remedy the problem.
A quick look recently in the Windsor/Essex County Ontario area revealed many places offering this illegal service.
My advice is to avoid this service completely and to also question the validity of the establishments that are offering and obvious scam.