We had a health checkup at school.

We had to go to hospital. My hearing was OK. My eyes had no problem. So I don't need to wear glasses. I grew 5 cm from last year! The only problem I had was that I have to go to the dentist's. I have two decayed teeth. I have to have a wisdom tooth pulled out.
From now on, I have to take care of my teeth. I will not forget to brush my teeth after eating.

(Would you like to check the passage? Thank you.)

It's pretty good ... nice work!

Here are three things, though:

1. Was the health check-up at school or at the hospital?

2. To correct fragment: My eyes were no problem, so I don't need to wear glasses.

3. You need the word "since" instead of "from" -- I grew 5 cm since last year!

Here are some additional points.

Who is the "We"? Without a referent, it is unclear. Might want to have it all in terms of "I" or specify the "we" group.

"We had to go to the hospital."

The passage you provided is correct and does not contain any errors. It describes your recent health checkup at school, stating that your hearing was fine and your eyes had no issues, thus indicating that you don't need glasses. It also mentions that you grew 5 cm since last year, which is good news. However, the only problem you had was with your teeth - two decayed teeth and a wisdom tooth that needs to be extracted. You have decided to take better care of your teeth and not forget to brush them after eating.