What could cause a tooth to have electric sharp pains? i get that only at night when eating sweets and if i lean my head down.

Early pulpitis: You may have a "pulpitis" (deep inflammation tooth) See a dentist ASAP! Hope this helps! Dr Z

Could be sinus or...: If it is an upper tooth, it could be a sinus issue affecting the tooth, or possibly an infection in the tooth that messes with the sinus. Sweet discomfort often signal some sort of broken filling or a fracture/chip in the tooth

A few thoughts...: .. your symptoms can be caused by a cavity, a cracked tooth, or a loose filling. Either way it should be checked out by a dentist and treated if necessary. Give a local dentist a call for an appointment.

Cracked tooth: you may have a cracked tooth or filling or decay. See a dentist and get your tooth checked. The longer you wait the more serious this tooth problem will get.

Acid: Sugar in sweets is like fuel to the bacterial plaque that may be sitting on the root surface or in a cavity on your tooth. A metabolic byproduct of the bacterial consumption of sugar is acid which causes tooth decay and can produce the symptoms you describe. It will only progress to more complications so get it checked out by a dentist ASAP.

See your dentist: for examination, diagnosis and treatment. If you ignore it and do not have the cause treated, it can potentially progress to a dental abscess and tooth loss. Take care.