Question

___（eat）too much sweet food is bad for your teeth

___（eat）too much sweet food is bad for your teeth.

Answer 1

Eating
Eating too much sweet food is bad for your teeth.
吃太多的甜食对你的牙齿不好。

Answer 2

你好，很高兴在这里回答你的问题：
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eating
动名词做主语