I dont think your blood pressure is the reason for your tooth ache,i have not come across with such a situation, to my best of knowledge there is no direct association with BP and tooth ache in a healthy tooth .But there is association with an infected tooth and BP. if there is any infected tooth ,when ever your BP goes up, the pressure within the blood vessel of the pulp chamber of tooth may also go up, there by the collection within the infected tooth may exerts more pressure on the nerve endings with in the pulp chamber of that tooth and which will aggravates your tooth ache.
Next Steps
first get a dental consultation to check whether any tooth decay is there.