<human>: Can you succinctly summarize the text in 1-3 sentences?

Hi everyone,

I have three cats, one outdoor (3 years old) and two indoor (< 1 year old). I'd been using Front-line but after the infestation persisted and switched to Advantage. After applying Advantage one of my younger cats started to foam from the mouth. I called my local vet and I was reassured that this may be caused by stress rather from Advantage itself.

Of course I begun researching all the different flea control products including Advantage on the internets (for better or worse) to discover its active ingredient imidacloprid is in fact a neurotoxin. 

So I was curious to know if there are any alternative remedies for flea control that are safer? I totally accept modern medicine and science etc etc but naturally like any pet owner discovering that you are administering a neurotoxin calls for a better treatment.
<bot>: Flea control product Advantage contains imidacloprid a neurotoxin, any better/safer treatments out there for cats?