Can I give my six month old zweiback or biter biscuits?

He is teething...no teeth yet. He is already eating puffs and cheerios, and we are starting third stage foods. As long as we are vigilant, do you think that zwieback or biter biscuits will help with teething? Or do you have suggestions on anything else (other than teethers or waffles) that may help those little pearly whites break through? I prefer something that is harder to choke on...I can't remember what age we started with biscuits, etc.