Can I swallow my saliva while undergoing treatment? June 17, 2021 13:26 Updated Yes, saliva can be swallowed. Related articles Is the gel safe to swallow? Am I allowed to eat or drink after application? The formula left a film on my teeth, how do I remove this? How do I use the Colgate Optic White Overnight Teeth Whitening Pen? Can I Use the Magik app on multiple Devices? Comments 0 comments Article is closed for comments.