I use a gel specially ordered from the dentist's office. I haven't been able to find a relevant and reliable study that confirms that LEDs increase the effectiveness of whitening gel, but for the price I just wanted to give it a try. *Also I'm not sure why there are bad reviews because there is no gel - the product description clearly says it's just a lightweight tablet?! It's unfair and I hope the company will challenge them. However my gel has always worked well but after 3 uses it didn't seem any better or easier than using the gel alone.
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