I know! Like I finally pull the brush+paste unit out of the travel pocket of my briefcase, find the paste has gone solid, lose a third of the bristles trying brush, try to decide how old the thing is, decide I maybe got it while I was traveling a lot for that company I left in 1993. Decide that my teeth are still cleaner than they would have been and there was no mold. Remember I never actually checked for mold. Pull old single-use mouthwash out of briefcase (checking for mold — good!), swish & rinse.