You should never eat while your Invisalign trays are in your mouth. The act of chewing puts immense pressure on the plastic, which can cause the aligners to crack, warp, or break entirely. Eating with them is highly unhygienic. Food particles become crushed and trapped between the aligner and your teeth, where they stay until you remove the tray. This not only looks unpleasant because the food is visible through the clear plastic, but it also creates a breeding ground for plaque and acid. This can lead to tooth decay and gum irritation within a very short period. To keep your treatment on track and your mouth healthy, always remove your trays for every meal and snack, storing them safely in their protective case.