flea & tick prevention: oil or pill method?

now that we have a child that often touches or climbs on the dogs is the oil safe to use?

The dogs have always rolled around on their backs after we put it on.....

Re: flea & tick prevention: oil or pill method?

My vet told me to put it on at night, before going to bed (when the baby is asleep I suppose) and then by the morning it is ok if you touch the dog there because it will be dry and absorbed by then.