Flea and Tick collars for small puppies

Is it safe to put flea and tick collars on small puppies??? My husband and I noticed a couple of ticks on one of our JR.'s, so we went to the pet store to find medication-or anything that would help. The only thing we could find was medication like Frontline-however they all said that you should not use them on puppies smaller than a certain weight and age. Our puppies are only 6 weeks old and the only thing we could find that looked safe was a Flea and Tick collar-for puppies-by Frontline. Are the collars too "powerful" for little puppies to be wearing? I know that when I get anywhere close to the collars I can smell them....and it's not too plesant! I would assume that if I think it stinks, they probably think the same. Could this get them sick? What should we do?