When you first get your braces on, your teeth will hurt for a few days, as they will every time you get your braces tightened or your wires changed.
Chamomile is also popular for anxiety in children. Fennel. Fennel isn't for anxiety specifically, but it is linked to treating some of the most common symptoms of anxiety, including digestion, coughing (many with anxiety have a nervous cough), and asthma (anxiety can exacerbate asthma symptoms).
Schisandra chinensis. Schizandra berries have been used traditionally as performance enhancers and as an adaptogen. Lots of human evidence from many decades ago in Russia that cannot be accessed, and limited Western evidence. Appears to also reduce anxiety and cortisol, with a tart taste.