Bruxism. Never have I come across a term better to describe the action of clenching one’s jaw, pressing the teeth together and then the final release of such grip.
No such term exists for the feeling which remains, so here it is: Anenula.
Anenula. The sensation of tension released post Bruxism. The feeling is initially pleasant and relaxed. However, it ends with the ache of wanting to repeat the action of Bruxism.