Tooth sensitivity is the most common problem these days. This arises due to wearing off the enamel which acts as a natural protective layer on tooth.
This enamel can wear off due to multiple reasons i.e forcibly brushing, using coarse toothpaste, hyper acidity in stomach with refulx etc.
Next Steps
for time being use a sensitive toothpaste available in market and best is to visit a dental physician
Health Tips
never use extreme temperatures simultaneously.