Here's why Canadian hair dryers die abroad: Canada runs at 120 V, and 28 of the 40 countries we track run at 220–240 V. A plug adapter changes the shape of the plug, not the voltage. A 120 V-only tool can overheat or burn out even with the right adapter.
Check the label first
Look on the tool or its plug for "100–240 V" or "110–240 V". If it says that, you're fine with just an adapter. Some dual-voltage tools switch automatically; others have a small switch you must set before plugging in, and forgetting is how people blow a fuse in a hotel room.
Hair dryers
The Dyson Supersonic Travel is the premium pick: universal voltage worldwide and about 330 g, much smaller than a full-size dryer. Note that the standard Supersonic models are sold for a specific voltage, so it's the Travel version you want. On a budget, a dual-voltage travel hair dryer with a folding handle and 1,000 W or more does the job.
Straighteners
Many salon-brand irons are dual voltage already, so check yours before buying. If you need one, a dual-voltage flat iron with auto shut-off is the peace-of-mind choice in a hotel, and a heat pouch lets you pack it while it's still warm.
You'll still need an adapter
Dual voltage handles the electricity; you still need the right plug shape. A universal travel adapter covers Types A, C, G and I. India, Pakistan and Sri Lanka also need Type D, which most universal adapters don't fit. And skip voltage converters: they're heavy and often can't handle a hair dryer's power. A dual-voltage tool is simpler and safer.