According to the passage about the Lucknow primary school, how often did dental students visit to check pupils’ teeth?
Read the passage: A primary school in Lucknow noticed that many pupils were missing lessons because of toothache. With the help of a local dental college, the school started a simple programme. Every child received a toothbrush and toothpaste, and after lunch each class brushed their teeth together for two minutes while a song played. Dental students visited twice a year to check pupils' teeth and teach them about the harm caused by sugary snacks and drinks. The school canteen replaced sweets with fruit and roasted chickpeas. After two years, the number of days lost to toothache had fallen by more than half, and teachers reported that pupils now reminded their own parents to brush at night.
Correct answer C. Twice a year
The passage states that dental students visited twice a year to check pupils' teeth and to teach them about the harm caused by sugary snacks and drinks.
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