Answer: decay

AnswerCrossword Clue
DECAYCause of radioactivity
DECAYGradual failure.
DECAYSpoil.
DECAYGradual decline.
DECAYTooth problem
DECAYCaries
DECAYTooth nemesis
DECAYCrumble
DECAYMolder
DECAYDisintegrate
DECAYDental damage
DECAYGo bad, as teeth
DECAYReason to drill
DECAYTermite result.
DECAYGo downhill
DECAYPutrefy
DECAYGet on with one's half-life?
DECAYX-ray disclosure
DECAYGo on with one's half-life?
DECAYRadioactive action
DECAYDentist's detection
decayto rot
decaygradual decline
decaydecomposition
decayto rot (to decompose)
decayto decline in quality, health, etc.
DECAYTooth trouble
DECAYFall into ruin
DECAYUrban ...
DECAYDentist's concern
DECAYRot
DECAYDental problem
DECAYDental concern
DECAYProgressive decline
DECAYDeteriorate
DECAYBreak down
DECAYDental woe
DECAYCrumble away
DECAYCavity cause
DECAYGo bad