Dear Sir ! Even i hate the sensitivity caused by Scaling and Root Planing. It is a annoying feeling but is bearable. She will not experience Pain per say. But just annoying sensitivity like when we get after drinking cold water. This Sensitivity is bearable by most. But if she is a little too sensitive, then i shall suggest Novocaine Gel. This is a Anaesthetic gel applied on the Teeth like a cream to Numb the sensation caused from Scaling and Root Planing. It is Non Invasive [No Needles :) :) ] so she can happily get treatment with reduced sensation.
Next Steps
Please consult the dentist about Anaesthetic Gel instead of Needles and make sure the Dentist advises a Mouthwash containing Chlorhexidine after the treatment.
Health Tips
Note : The sensitivity will be further reduced if she uses "Sensodyne Toothpaste" 5 days before the treatment and after the treatment. Always remember everyone has different levels of Tolerance to Pain and Sensitivity. some may feel something as Sensitive whereas others may sense the same as Pain. No Dentist can ever promise a 100% Painless treatment without the use of Local Anaesthesia to numb the Local nerves directly, even so some people may still feel what we call as Pressure (In Lay Man terms), the sensation of something foreign where its not supposed to be.