Dentist
noun
You know that a 医者 is a doctor. So what is a tooth doctor? A dentist. Seriously, don't forget to floss. 歯医者 hate when you forget to floss.
はいしゃ
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
半年に一度は歯医者に行った方がいい。
It's better to go see a dentist at least once every six months.
花田さんは、この歯医者にはもっ体ないよ。
Ms. Handa is too good for this dentist.
彼はただ不良に憧れてるだけだと思うよ。絶対に本物の不良にはならないね。だって、歯医者さんに行くのですら怖がってるんだよ！
I think he’s just a wannabe delinquent. I doubt he’ll end up being a real one because he’s still afraid of going to the dentist.