Is this necessary to replace new teeth if teeth been broken ?

Please clarify: are you referring to dentures, dental implants, veneers? What is meant by new teeth? Can re-ask with clarification.

NO: In most cases a CROWN or PROSTHETIC CAP will suffice. Consult with your Dentist!

Broken teeth: Broken teeth should be repaired or replaced. See a dentist to discuss your options.

Depends: Some people are missing teeth and do pretty well. Others require replacement of missing teeth for various reasons. Replacement of missing teeth is often desirable but not always essential. If dental care is available to you, get evaluated to understand your options, remembering that replacement options in the future may be available even if immediate tooth removal is required.

Missing teeth: can affect the chewing ability, aesthetics, speech and entire facial structure. There are several options available to replace missing teeth. Speak to your dentist about your your individual treatment plan.

Replacement teeth: It is always best to replace decayed, broken down and missing teeth with replacements. This maintains the integrity of your dentition, relieves excess stresses on your other teeth, and allows you to eat, speak, and function better. It also is less expensive in the long run.

Yes: If tooth lost your other teeth will shift. Seek the best (not the cheapest) dental care available, and go now.