How do I get an almost 2 year old to brush their teeth?

Ar first he was really intrigued, now he refuses to open his mouth to brush his teeth. Is there a trick to this or is he still too young? His doctor says he should be brushing his teeth twice a day... but he refuses I have to force his mouth open and I feel bad doing that

How do I get an almost 2 year old to brush their teeth?
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