The phen might be at too high a dosage for you. Or maybe you need 2 drink more water. That's the reason I stopped taking it for a while. My jaw was killing me, as well as my teeth because I would find myself clenching them during the day. And imagine what happens at night while we are sleeping!
Don't take a pain kiler to ignore it, because then you'll start getting headaches and sensitive teeth.
Hope this helps!
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