Mouthing and illnesses

An always unwell child is constantly mouthing..Nothing is safe and he always is putting in fingers and whole hands in his mouth. Obviously we do our best as a team to do handwashing asap, but he has been on and off unwell since joining my classroom.

Mom did once mention his mouthing to us but there really isn't anything we can do to prevent it at this age.

I guess I am just feeling unsure what to say at this point as he's been sent home on numerous occasions since November. :(