One of the biggest complaints arising from curling irons is burns. With the shaft of the curling iron anywhere from 350-400+ degrees, it's a serious concern. You also don't want a curling iron that will burn nearby objects if accidentally set down wrong.
When choosing hair irons, consider products that will automatically shut-off when left too long, or that sense when there is overheating. Some curling irons are designed specifically so they can't be set down improperly. In all instances, take a close look at the safety options available, with temerature and use foremost in your mind.
That should be enough for you to choose well, and put to rest any concerns that might arise otherwise.
After much instruction and watching her use it the first few times, age 13 is a good age to start with a curling iron. Make sure you explain about electricity, and not leaving it close to the water at all. Explain carefully how dangerous it can be.
Perhaps set up a metal table in the bathroom to place the curling iron on, and ensure to check it is unplugged after usage.
We got my daughter her first curling iron at age 9. She seemed to do ok with it. My wife used her curling iron on my daughter many times prior.
Since your niece may not have ever seen a curling iron, you may want to practice many times with her first, before leaving her alone with it or unattended. You should start with a basic curling iron from a regular store that does not get very hot. The less expensive curling irons usually have one temp setting and they do not get as hot as the ones sold at beauty supply stores.
Maybe suggest she only uses it when her dad is there to watch.
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