You can have them check with the pediatrician if they are not sure. The antibiotics and pain meds go from categories L1 (safest) to L5 (not safe). For pain meds Acetaminophen and Ibruprofin would be the safest. Hydrocodone, codeine, and Oxycodone are all L3 (moderately safe). And since your baby is a little older it is probably better. 22 teeth?? Wow. I feel for you.