Making Sherbet: Can you tell me if any safety precautions are required for the sherbet activity, which allows students to create an acid–base reaction in their mouth?

Making Sherbet: Can you tell me if any safety precautions are required for the sherbet activity, which allows students to create an acid–base reaction in their mouth?
This online resource looks at acid-base reactions.
The resource provides a range of activities to do with some key chemical concepts relating to hair care, shampoos and conditioners.