Is composite resin used to fill in gaps in front lower teeth?

Sometimes: Bonded composite fillings are sometimes used to fill in spaces between teeth. Each case is different and this is a subject that you should discuss with a dentist who can actually examine you to discuss your options and both advantages and disadvantages to each option.

Many options: Yes that is one way but also consider braces to close the gaps and lamintes if you want a more long lasting treatment. Composite can be used for the quick result chuck.

Yes...: Composite bonding may be the best option to close gap between lower teeth, because no teeth grinding is required on the already small lower teeth, and the amazing esthetic result that can be achieved by a really artistic cosmetic dentist.

Yes, but: Yes, but other options exist. See your dentist.