The life cycle of a mite is about 3 weeks. One needs to make sure they are using a treatment that kills both the larva and the mites in the ear as well as using soemthing on the cat/dogs body around the neck and face that some mites can hide and than crawl back in. Make sure bedding and or any other animals in the house are also mite free so as not to get reinfected. Also making sure you are administering the medicine correctly. Below is a link showing one exactly how to do this.
I coudn't tell you if you Vet was negligent or not in determining if any more mites were present. If you still see debris and the cat is still shaking the chances are it could still have them..maybe even down deeper. Being you don't seem satisfied with your vet if it were me and I felt this way than yes I would go get another opinion.

Here is a link that might be useful: How to medicate your cats ears

Thank you for your help.Will have to make up my mine about changing vets.He never gave me any Meds. He applied the drops in my kitty cat's ear himself.

goldy, sure recommend you look around for new vet. We 've had trouble with earmites before and vet always sends home meds to continue treatment with.
oakleif

There is a prescription formula of Ivermectin that vets use to treat earmites. Sorry I can't think of the name of it right now. Maybe Meghane can post the name of the drug. It's a one time application and shouldn't cost more than $15, if that much.

Trained vets can use straight Ivermectin, but since it's not formally approved for dogs and cats, they've come out with this diluted formula and put a big price on it. It does the job though so it's worth the cost.

He never gave me any Meds. He applied the drops in my kitty cat's ear himself.

Maybe he applied the Ivemectin like Brutuses mentioned. Do you have any record as to what was used? If not I'd call the clinic and ask what was used just so you know. And for the record never be afraid to ask questions, in fact never leave the office without having full disclosure about any procedure.

There is a one-time mite treatment but I am also drawing a blank on the name of the medication. It works really well, so selling you a take-home treatment would have been just jacking your bill up for no reason.

They probably did a physical exam, ear cytology, and the treatment.

Some cats just have dirty ears. You can clean them yourself using an OTC ear cleaner. I use Epi-Otic for my own dogs, just once or twice a month. It keeps their ears clean and infection-free. Most adult cats are very resistant to ear mites, but I've seen many cats with black stuff in their ears and it wasn't any kind of infection.

Meghane Thankyou.I feel a little better.Will clean her ears myself and see if it clears up.By the way if anyone needs to spray their pet go online and get a coupon from"Friends of Animals $65.00 for cats and $95.00 for dogs.