Is it ok to brush just once a day?

While I
think it would definitely be better to brush twice a day, it's not ENTIRELY
necessary to brush in the morning. You should absolutely brush before you go to
bed at night because the food sits on your teeth and the acid will eat away at
the enamel. The reason peopel brush their teeth in the morning is because
bacteria sits in your mouth and causes it to smell bad, but since there's no
acid on your teeth (provided you brushed before bed) then it will not damage the
enamel.

But I would still recommend brushing twice a day, especially if you want whiter
teeth.
no thats gross...i mean think about it...you eat food....and then when you sleep
without brushing your teeth the food in your mouth rots..thats why u get bad
breath while u sleep! and if u just brush ur teeth at night u get bad breath
anyway..and then go all day? i mean come on no one wants to kiss someone with
morning breath! just brush ur teeth it takes 2 minutes and makes ur mouth feel
all fresh and minty!!! and it keeps your teeth clean and cavity free if u do it
right! and white too!
no especially in the morning even thought your breathe may seem clean at night,
you still have to do it to have nice smooth white teeth keep them choppers
pearly white :D
Yup, It's okay.