1.   Teeth usually become less sensitive as their nerve and blood supply Decreases.

2.   By now the tooth had become a real nuisance, and he really wanted it out.

3.   Teeth can temporarily become a little sensitive.

4.   The teeth often become sensitive to heat and cold and remain so for days or weeks after completion of the process.

5.   When the enamel wears away, the tubules become exposed and teeth become sensitive.

6.   A tooth can become sensitive when the second tooth layer, the dentine, is exposed.

7.   There are certain conditions whereby the teeth can become abnormally yellow.