Is it possible to have root canal on crooked tooth (more or less at the angle)? how risky is that? what if a tooth is almost horizontal?

Root canal: A root canal can be done on a tooth that is not in an ideal position if is an important tooth to maintain. If a tooth is too crooked then it may be better to replace the tooth with a implant. Discuss this with your dentist before the root canal. The long term prognosis of the tooth and the surrounding teeth will be factors in deciding if a root canal is the best treatment.

Definitely, yes: The root canal therapy is a dental treatment to repair and save a badly damaged or infected tooth instead of removing it.Braces can be put on teeth with root canals and crowns. Teeth that have had root canals can be moved just fine with braces treatment.