Dear Sir.
As I can read you have two separate issues.
a.) Discoloured Tooth
b.) Malaligned teeth.
Very often in case of malaligned teeth we observe patient giving a history of fall or other accidental injury causing chipping of tooth structure. However patients often ignore it initially as they consider treatment is needed only if there is pain. Over the period of time, due to injury of pulp ( combination of nerves and blood vessels in the tooth ) the tooth starts to change it colour . To address this situation the line of action is a radiograph to evaluate status of root of the tooth & possibility of associate bone loss. Such tooth are often addressed by RCT followed by individual crown.
Talking about the second issue, there are multiple treatment options to realign positioning of teeth in both the jaws for not just improved esthetics but also improved functioning. You can opt from a varied range of treatment option from traditional braces to Damon system to Aligners depending upon your requirement.
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We, at The Tooth Dental & Orofacial would be happy to help you.