there are many reasons for sensitivity like abrasions...caries..enamel wear off.. go for the checkup and proceed with the treatment.

Namaskaram, Tooth sensitivity is exactly what it sounds like pain or discomfort in the teeth as a response to certain stimuli ( hot ,cold or acidic drinks ). It may be temporary or a chronic problem, and it can affect one tooth, couple of teeth, or all the teeth in a single individual. Here are some causes for sensitivity: 1.Brushing too hard or using a hard toothbrush. 2.Gingivitis.( Inflamed and sore gum tissue can result in exposure of the tooth's root.) 3.Fractured teeth 4.Teeth grinding or clenching. This can wear down enamel. 5.Plaque build up. 6.Long-term use of mouthwash

You need to visit Dentist and get proper clinical examination. You might have cavities or lot of calcus deposits. Start using Vantej toothpaste for gum care and in mouthwash use Chlohex ADS mouthwash