From Longman Dictionary of Contemporary Englishkick somebody in the teethkick somebody in the teeth (also kick somebody in the stomach/pants American English) informal to disappoint someone or treat them badly at a time when they need help We all have times when life kicks us in the teeth. → kick
Examples from the Corpus
kick somebody in the teeth• Graham sitting there waiting for me to kick him in the teeth.• If he had come begging and pleading, I would have laughed at him and kicked him in the teeth.• I couldn't kick him in the teeth after three years of good work and live with myself. 