hello as per the image provided by you the situation doesn't even require even a X-ray it appears that your tooth has been broken a bit.
you have two options to choose from
1. if the sensitivity is severe then get the broken part is f the tooth restored by a composite filling.
2. if the sensitivity is minor just use a sensitivity tooth paste and according to me I would suggest you Colgate pro relief the best in the over the counter product.
take care and hope your issue gets resolved.
Both Picture & symptoms dipicts the condition of enamel wearout. If there is a severe form of sensitivity than IOPA (or x-ray) is advisable. But you need not worry at all because it is not a big problem & most probably a single visit simple light cure restoration (or filling) will cure the problem.