In my opinion, parents should strictly limit teenagers' screen time for several important reasons.

Firstly, teenagers often have very little time left for their homework because they spend too much time watching online videos, checking social media, or playing computer games. This can affect their academic performance and overall learning.

Secondly, too much screen time is harmful to teenagers' health. It can damage their eyesight, reduce the amount of sleep they get, and cause weight gain. Therefore, limiting screen time is necessary to help teenagers maintain good health.

In conclusion, parents should set strict limits on screen time to ensure teenagers focus on their studies and stay healthy.