It could be. It depends on lots of things.
Gums generally designed for our teeth and gum so it should be fine!
1.How many tablets a day ? 2.How many tablets of gum in the same time ? 3.Sugar or non sugar ? 4.If the person have previous teeth issues ? 5.Gum sensitivity and achene ? 6.Sugar rate problems ?
Chewing gum everyday could risk your teeth's health, your blood's sugar rate and excessive usage cause pain in your jaw. So a balanced usage is the ideal and should be fine!