Is your child ok to chew? Its lemon flavor. If not, get the oral drops.
For the oral drops, its cheaper to get from the pd clinic directly. Pharmacy carries too. It's basically a probiotic drop good for the stomach gut.
If your child can chew, the tablets are cheaper. I order directly from drugstore to save. Retail carries too but more exp.
My boy is now 5, at the stage where tooth is dropping and he tends to shake his shaky tooth. Hence, I still continue him on the tablets daily to minimize any chance of infection. Hope this helps