Official Sloth in pocket shirt
I always had a toothbrush with me. I used the plastic bags from the MRE combat rations to protect the brush from dirt. You get used to cleaning your teeth while doing something else at the same time like watching the terrain, listening to an officer giving orders or checking your rifle. There is really no excuse for not brushing your teeth.
Buy this shirt: Official Sloth in pocket shirt
From: https://usat-shirt.com/