Is deodorant safe for a 7 year old kid if so what kind is best?

Some brands may not be safe in the hands of a 7 year old kid. One option that is healthy, long lasting, not sticky, non-staining and pretty inexpensive is a deodorant stone, which is made of potassium alum. They can usually be found at herbal pharmacies and health food stores.

Or there is an Arm and Hammer deoderant that is safe for kids all the way to age 5.