Compared to the 35% whitening gel, the 44% whitening gel has a slightly higher chance of causing temporary gum irritation because of its higher concentration. However, you can greatly reduce the likelihood of irritation by applying only a thin line of gel and making sure it stays on the surface of your teeth rather than leaking onto your gums.

After inserting the tray, simply check for any excess gel and wipe it away with a q-tip or tissue before beginning your whitening session. When used carefully and as directed, most users can enjoy the enhanced whitening power of the 44% gel while minimizing the risk of temporary gum irritation.