Hi S.,
I used the nighttime orajel all the time until I spoke with my pediatrician about it. He suggested not using either one at all. It does wonders when it is first applied, but it tightens the gums, so when the tooth is actually breaking through or growing, it causes more pain. It is made to do that so you use more of it, more often, then need to buy more, etc, etc...
I used those teething tablets and they were wonderful. They were made with all natural ingredients so they can be used extremely often. You simply massage them into the gums and they dissolve as you do that.
Good luck with whatever you decide to use and I hope your son is feeling better soon,
L.