Like a broken tooth or a lame foot is reliance on the unfaithful in a time of trouble.
OJBConfidence in a boged in the yom tzarah is like a shen ra'ah (bad tooth), and a regel out of joint.
T4TDepending on unreliable people when you have troubles is as bad as trying to eat when you have a bad/hurting tooth or trying to walk when your foot is crippled.