There are a few potential risks associated with driving a car with a broken flywheel. First, as mentioned above, the engine may run erratically or stall. This can be dangerous if it happens while you are driving, especially if you are in traffic or on a busy road. Second, the broken flywheel teeth can cause damage to the engine's starter motor or ring gear, which can be costly to repair.
For these reasons, it is generally not recommended to drive a car with a broken flywheel. If you suspect that your flywheel may be damaged, it is best to have it inspected and repaired by a qualified mechanic as soon as possible.