Do Radiofrequency Lasers Really Work for Mild Skin Tightening?

Do lasers that claim to tighten skin (Matrix RF etc.) really work for mild tightening?

I thought the weakened muscles under your skin was the reason for skin laxity, and I know lasers won't help that...

I thought non ablative RF lasers would melt existing fat in ones face (like thermage) making them look even older? Confused! Thank you!! : )

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