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Risks of Needle Free Filler Pens
A filler pen with no needle sounds like an easier deal. Treat it as a trade-off you should see in writing.
This page covers one product type: needle-free filler pens. It sets what the American Academy of Dermatology says against what the pen promises, and it ends on the paperwork to ask for. For consumer guidance on any filler, see the do's and don'ts for wrinkles and lips.
What the dermatologists say about the pen
The American Academy of Dermatology says that while needle-free fillers may sound like a welcome breakthrough for fuller lips and fewer wrinkles, the risks greatly outweigh the benefits.

Weighing the pen against an injection
With that warning on record, the burden sits with the provider offering a pen. Ask them to explain why it suits you and to put that explanation in writing.
A dermatology guide to needle-free filler risks and a dermatologic surgery group's question-and-answer on filler safety are worth reading before that conversation.
What to have in writing before you agree
Get the product name, who will use it, the number of visits expected and the fee for each, written down. Never accept a pen on the day because the quote is low.
Check any product name against a federal overview of soft tissue fillers before you agree.