12 Pcs Aligner Seaters for Invisalign & Clear Aligners - Multicolor Silicone Orthodontic Chompers - Dental Chews for Retainers & Trays Seating

Did you get any chewies from your ortho? After putting in your trays you bite down on them (they're rubbery) and it helps seat your trays. Even after using though there may be slight spaces which is okay because that'll allow your teeth to move into them. You can get chewies on Amazon - there are tons of varieties.