Simple lifestyle changes, including brushing, flossing, and a diet change will drastically improve your oral hygiene.
You need another comma after "change". The comma before "and" (so-called "serial comma") is a style choice. Some people choose to include it, while others omit it.
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You need another comma after "change".
The comma before "and" (so-called "serial comma") is a style choice. Some people choose to include it, while others omit it.