Dental Polishing Strips, Teeth Abrasive & Finishing Strips 4mm x 6M, Inter-Dental Oral Care Cleaning Tool - Sanding Grinding Whitening Teeth (Blue) - 12 Months Warranty

Dental polishing strips: https://a.co/d/04EAWzQD These are available for about a dollar per roll on AliExpress. The paper threader trick: https://youtube.com/shorts/tHHY-vXGAg4? If you snip one end so it's pointy sometimes it's even easier. You can just get beading needles though! It sounds like you may have a defective needle.