hello and welcome,
as per the description given by you,you had undergone cleaning by your dentist
that means there was accumulation of plaque
,food debris and calculus on your teeth.
since the pain started once you were using the whitening toothpaste,there is a chance of cervical abrasion/gingival recession/mild attrition in your lower front teeth.
visit your dentist to diagnose the problem.
abrasion is mostly due to abrasive dentifrice whereas gingival recession is due to incorrect method of tooth-brushing/high frenal attachment/gingival inflammation/tooth malposition/gingival ablation.
the teeth involved by periodontal disease can be saved if the bone loss is not too extreme,if irritants are removed by scaling and curettage and if pockets are eliminated by gingival recession or by surgical removal of gingiva,ie,gingivectomy
as a result of this,re-attachment of new periodontal ligament fibres occurs.finally new alveolar bone must be built.
in cervical abrasion cases,tooth coloured restorations with GIC/COMPOSITE RESINS can be done.
always brush your teeth using soft interdental brush
,without applying much force while brushing.
brush your teeth in upper arch from top to bottom and in lower arch from botto to top.