errkk first of all, how do u know it is lice? lice very hard to see with eyes, but u can see their eggs attach on hujung bulu like dandruff. lice are white white thing and alil bit transparent.

but if u said FLEAS!, then i understand how bad it is. Lice is not that bad.

Fleas is the worst, then ticks, then mites, then ringworm.

be extra carefull if u spray on kitten, make sure you read the back pack before you spray.
"amount to spray = body size".

what brand do u use? FRONTLINE is a good brand.

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Why that thing tak mati?
- first, because when u spray, u are actually kill the adult sahaja, but not the eggs.. bila eggs menetap, they will still hidup.
- second, your house kena serang. i mean, they are not fully on cat body now. they are hiding somewhere like carpet, sofa... carpet is their number 1 best friend to lays egg

Solution?
- to kill eggs? try FRONTLINE SPOT ON. Spot on will be suck into the layer of their skin. bila telur menetas, anak akan terus gigit kulit for blood.. they will get that poison and die. beside SPOT ON type your cat will look nice because u tak spray.
- vacuum all your carpet and sofa everyday.
- sikat your cat supaya telur2 tu jatuh.
- mop lantai dengan bersih.

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good luck eh if you doing it, do on all cats. if you have 3 kittens, do on all 3 on the same time.

else no point doing on one cat then next day another cat. must be all serentak.