If we don't brush teeth, we have a cavity. And our mouth is smelly. So we have to brush our teeth

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Thank you, Eric for making your homework. ^^ Yes, this is correct. That's why Eric and Ryan need to brush their teeth so you will not have toothache.  Brush your teeth after every meal.

 Anyway, teacher Cassie is going to correct your sentence construction so please take note of the changes.

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> If we don't brush our teeth, we will have cavity and our mouth will be smelly.  So we have to brush our teeth.

Take note of your corrections, Eric and study well. See you on Friday.

~Teacher Cassie