My oneside teeth was wesken. i can't crunch any food. how can i fix? which is the problem in it? is it weaken or infected?

See a dentist.: Good dental evaluation. If you have infection it's usually painful.

Cracked tooth: A tooth that has previously been fine and only hurts to chew is a symptom of a cracked tooth. The actual tooth is often difficult to isolate. Once identified, a crown is the usual treatment. However even, even after the crown is placed it can be months before the tooth is back to normal.