Thanks for asking the query,
Numbness in face, ears can be of dental origin, there can be a chance of trauma to the facial nerve
at the time of performing the dental procedure.
Ringing sound in the ear can be due to TMJ abnormality, ear infection
I would suggest you to visit the Dentist
and get the checkup done.
Also get the clinical examination done by ENT specialist
Maintain a good oral hygiene
Hope this helps out.