Hello doc ... half of my front tooth breaks down how can i treat it to make my smile normal?

Broken tooth: A Dentist can put a cap on the tooth to make your smile normal again. See one as soon as you can.

See a dentist: I don't know of anything other than see a dentist. There are some pretty amazing things they can do these days to restore your teeth and your smile! Tooth breakdown really needs to be checked in order to avoid losing the tooth altogether.

Call a dentist: You'll need to see a dentist to restore your broken tooth. No home treatments available.

And what else: Is that the only Dental problem, or is that just the tip of the iceberg? This is't a DIY project. Even Dentists have other Dentists do their own treatment. Self treatment is not advisable. Call a Pro, call a Dentist, while you still have something to repair. "Repair" is often easier, cheaper, simpler, than "Replace."