EverSmile AlignerFresh Extra Whitening Foam – Cleaner Compatible w/Invisalign and All Clear Aligners and Retainers – Eliminates Bacteria, Whitens Teeth, Fights Bad Breath – 50ml (1 Pack)

It’s not hygiene. The attachments are porous and take in the color/dyes of the food you eat. I am the same. I have naturally brilliant teeth that are yellowing due to my diet with attachments. It happens I care more about eating curry than the attachments lol. I do use a peroxide based whitener that I got on Amazon. It has helped non-affiliate link

EverSmile AlignerFresh Extra Whitening Foam https://a.co/d/04bpWRYI

This stuff in “extra whitening” has made a huge difference for me- https://a.co/d/0amSEJ7P

u/kattgirl_1998 This one https://a.co/d/02gsTVdM or this one (extra whitening) https://a.co/d/01vNTUMB ? Thanks!

https://a.co/d/03SKaBm6 I don’t know if they work similarly, but I’ve been using the extra whitening version of this and I love it.