My mother in law with alzheimers uses too much toothpase, will swallowing some harm her?

Five months ago we moved my MIL with AL in with us , her teeth were brown and I mean brown due to not brushing . ok we got her a new tooth brush and mentioned she needed to brush . She started brushing but now she is going crazy with the brushing , I'm going through threw a large tube of tooth paste a week . I'm pleased she is bushing but I'm worried she may get sick from so much tooth paste as I don't know if she is swallowing some the the paste or not , so will this harm her ?