The formation of plaque and halitosis can be avoided by brushing and flossing at least: once a day twice a day three times a day every other day

The question says, the formation of plaque and halitosis can be avoided by brushing and flossing at least The correct option is 'twice a day'. It is recommended that one brush his teeth after every meal, but if this is not practicable, then at least twice daily, morning and night. This helps to maintain the teeth in perfect condition.

An advantage of an mri over ct scan is d. it produces better images of hard tissues. hope this : )