Honestly, in the beginning, i will brush whenever after meal. Soon, i just gargle.
Now, i dont brush anymore. I have a mirror, toothpicks with me and korek the food out from being visible only....
*Don't laugh...i know it sounded disgusting...
When i go out makan with friends, i will sometimes stuff my finger in my mouth to adjust the dental wax or my tongue will glide my teeth and etc... I know its not a very pleasant sight to look at. But i do it in the washroom, or bend down under the table and all la... Try not to let ppl see. Other than that, actually my friends and family all use to it and people around me understand my action. So they will tolerate me also.
To be honest, if u need to brush in the office. Its totally alright. Afterall, its good manner to brush after u eat. Rather than having food stuck at ur teeth right or not? I'm sure your colleagues would understand. Dont worry my dear, its not weird or strange at all. I'm sure they rather u using the toilet to brush teeth than seeing food stuck at ur teeth.
In my ex-company, some account managers also practice to brush teeth after lunch. Cos these are the people to represent the company to see clients. So they have to hav a good image. They even floss in the office ok?
Does all above makes you feel better? Dont worry la my dear. Every time after makan, u just bring out ur mirror to check ur smile. If u see food stuck in between teeth, just quickly go washroom and gargle to get rid of it first. Toothpicks are very useful. So have it with you. Then only go back office to brush lo. Other than that, avoid Fried rice and chilli stuffs lo...

Hope these helps
oh....thanks alot for ur suggestion.. cos so far i nvr see my colleague or managers who brush their teeth so im worried it would be weird...
but if dun brush after eating i will feel uncomfortable and feel like erm...geli...especially after eating those food that really stubborn stuck in the teeth one haha.. Sometime when going out also cant brush..i always bring and use toothpicks as well.. go home only brush it...
haha yeah i feel better...think i will put one in my office in case the food really couldnt be removed by using toothpicks...