Hi thanks for your question.
are known for their allergic reaction
It is not necessary that once the allergy
test is negative,you will not develop alleric reaction to particular drug.You can develop allergic reaction,even after negative allergic allery test,because allergic reaction also depends upon the concentration of drug injected.If you sevelpoed allergic reaction to both the local anaesthetics,your Dentist
can try Bupivocaine for procedure.
Hope this answers your question.