PE 11/4 Cavities? Oh No!

I'm at my wit's end. I just came back from the dentist and they told me I have cavities.
* at one's wit's end: not knowing what to do; almost in a panic
ex> I was at my wit's end because the puppy kept peeing on everything in my bedroom.

I guess you need to take top-notch care of your teeth from now on.
* top-notch: the highest quality; the best care
ex> The top-notch care the doctors provided led Chris to a full and fast recovery.

You don't understand, I've always gotten a clean bill of health, and they found 16 cavities!
* clean bill of health: no illnesses or symptoms of physical problems.
ex> Symptoms of lung disease began to appear despite the clean bill of health his doctor gave him 6 months earlier.

Well, the dentist told me to cut back on soft drinks and red wine. She said the acid in there would go through my enamel like a hot knife through butter.
* cut back on: 줄이다
* like a hot knife through butter: quite easily; very sharp
ex> The bullets fired from the machine gun went through the car like a hot knife through butter.

It's going to be hard to quit both of those habits cold turkey. I guess you should just try to find a happy medium.
* quit cold turkey: 확실하게 끊다
ex> quit smoking cold turkey.
* happy medium: a compromise that is neither too uncomfortable nor too pleasurable
ex> While Ryan wanted to live in the city and Sarah wanted to be on the beach, they found a happy medium - an apartment in the city with a view of the ocean.