Was unsure what to expect as i saw more expensive models. Without UV lights. So glad i bought this one instead. Definitely get one with a UV light. Black wasn’t in stock before New Years. I made a last minute change by email. As they came back in, not long after my order. They swapped immediately before sending. No hassle. My Invisalign's were disgusting as i had the same ones for 6 weeks. I’d tried tablets, brushing them with a toothbrush. While waiting for my new aligners to be ordered in. One use of this without a tablet. I genuinely couldn’t believe it. They looked crystal clear. I’d tag a picture but it doesn’t really do it justice on how clean they were. No longer have bad tastes after wearing for a long time. I will once in a blue moon combine with a tablet. But i don’t really think it’s necessary anymore now i have this. Worth investing for the health of your teeth while wearing invisaligns. Hope this review helps someone who’s doubting the purchase!