Sorry to tell you, but a tooth cannot heal itself once it is broken. I broke my front tooth when I was 6. Unfortunetely I had to get a rootcanal, and then the broken part was ‘bonded’ back on. What they did to it, and most probably to yours, was put white filling called composite to replace the broken part. Unfortunetely, composite is hard to match to the tooths natural enamel color. It will always look slightly different. Another bad thing about composite is that with time it darkens, and cannot be bleached. You’ll have to get the composite changed every few years to match with your other teeth or it will become very visible.
It’s true that you have to be careful with it now. The tooth is now weakened and could break off if you eat a baguette, or bite into an apple…Your best bet would be to get a veneer. IThe best way I can describe it is that it’s like a fake nail for your tooth. The dentist will prepare the tooth (pretty much shave off the front .5mm) and take an impression to later fit the veneer. It puts the strenth back; sort of. It will look much better and match better because it’s made out of porceline. It will be shinny like your other teeth too. I don’t know if you’ve noticed, but if you dry your broken tooth, it isn’t shinny like the others but mat.
Down side to a veneer: It doesn’t bleach either, so you have to take good care of the other teeth. You’ll get the opposite effect here. One white tooth, and the others darker. The only other thing is that it could un-cement, but can be put back on. Just be careful with it, and avoid it if you can, but don’t stress if you forget and eat a sandwich.